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DOE OSTI2020

Materials Data on Ba5Nb3O3F20 by Materials Project

Ba5Nb3O3F20 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a 11-coordinate geometry to two equivalent O and nine F atoms. There are one shorter (2.79 Å) and one longer (2.93 Å) Ba–O bond lengths. There are a spread of Ba–F bond distances ranging from 2.75–3.01 Å. In the second Ba site, Ba is bonded in a 11-coordinate geometry to eleven F atoms. There are a spread of Ba–F bond distances ranging from 2.74–3.02 Å. In the third Ba site, Ba is bonded to twelve F atoms to form distorted BaF12 cuboctahedra that share edges with six equivalent NbOF6 pentagonal bipyramids and faces with two equivalent BaF12 cuboctahedra. There are six shorter (2.64 Å) and six longer (3.10 Å) Ba–F bond lengths. Nb is bonded to one O and six F atoms to form NbOF6 pentagonal bipyramids that share edges with two equivalent BaF12 cuboctahedra. The Nb–O bond length is 1.78 Å. There are a spread of Nb–F bond distances ranging from 2.04–2.14 Å. O is bonded in a distorted single-bond geometry to two equivalent Ba and one Nb atom. There are five inequivalent F sites. In the first F site, F is bonded to four Ba atoms to form a mixture of face and corner-sharing FBa4 tetrahedra. In the second F site, F is bonded in a 1-coordinate geometry to two Ba and one Nb atom. In the third F site, F is bonded in a 3-coordinate geometry to two Ba and one Nb atom. In the fourth F site, F is bonded in a distorted trigonal planar geometry to two equivalent Ba and one Nb atom. In the fifth F site, F is bonded in a 1-coordinate geometry to three Ba and one Nb atom.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Stabilization of Preternatural Barium Oxidation States as an Unexpected Byproduct of β-Decay: Discovery of a New Halide Semiconductor Alloy

137 Cs has a wide range of roles in the nuclear industry. The solid material, safely encapsulated in CsCl as 137 CsCl, is stored as fission product waste from nuclear power production and legacy waste from nuclear weapons production; it has also served as a radiation source in food and sewage irradiators as well as medical devices. However, because of the solubility of the chloride salt and the relatively high specific activity of 137 Cs, damaged or broken capsules can lead to severe radiological accidents. Safe capsule design and material recycling are complicated by the unclear structural evolution during β-decay, which remains ambiguous due to the differing oxidation states of Cs (1+) and Ba (2+). Here, in this study, we use first-principles calculations to investigate the evolving structure–property relationships of Cs 1–x Ba x Cl during β-decay. Despite the well-established 2+ formal oxidation state of alkali-earth metals, we find that Ba 1+ can be stabilized in the form of a mixed-valence alloy at low concentrations. Specifically, we identify three regimes for the β-decay of 137 Cs into CsCl: Ba-doped CsCl (Ba ≤ 14%), wherein Ba has the expected 2+ oxidation state; Cs–Ba–Cl alloys, where Ba has a mix of the usual Ba 2+ and highly unusual Ba 1+ oxidation state in the form of a quasi-disordered mixed-valence alloy (Ba = 25%); and phase separation into a CsCl + BaCl 2 + Ba (m) mechanical mixture, where Ba reverts to its expected 2+ oxidation state (Ba > 25%). Surprisingly, the Cs 0.75 Ba 0.25 Cl mixed-valence alloy is a narrow indirect band gap semiconductor (1.05 eV) despite the insulating nature of both CsCl and BaCl 2 . It also exhibits strongly excitonic polarized optical properties, has glass-like ultralow thermal conductivity (directional average of 0.21 W/mK at 300 K), and shows greater resistance to deformation under both tensile and volumetric strengths compared with the original CsCl structure (e.g., shear and Young’s modulus of 9.04 and 31.62 GPa, respectively). These findings imply that transmutation of 137 Cs leads to highly unusual chemical bonding that stabilizes Ba 1+ in local regions of the quasi-disordered Cs 0.25 Ba 0.75 Cl, resulting in anomalous physical properties. Moreover, this discovery provides valuable insight for safe nuclear waste capsule design, which can aid in preventing environmental or human exposure to radioactive materials.

Fuhr, Addis S. [Oak Ridge National Laboratory (ORN↗
DOE OSTI2020

Materials Data on Ba3(GeN)2 by Materials Project

Ba3(GeN)2 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a 5-coordinate geometry to one Ge and five N atoms. The Ba–Ge bond length is 3.72 Å. There are a spread of Ba–N bond distances ranging from 2.76–2.95 Å. In the second Ba site, Ba is bonded in a 2-coordinate geometry to three equivalent Ge and two equivalent N atoms. There are two shorter (3.61 Å) and one longer (3.86 Å) Ba–Ge bond lengths. Both Ba–N bond lengths are 2.82 Å. In the third Ba site, Ba is bonded in a 3-coordinate geometry to three equivalent Ge and three equivalent N atoms. There are two shorter (3.59 Å) and one longer (3.82 Å) Ba–Ge bond lengths. There are one shorter (2.69 Å) and two longer (2.83 Å) Ba–N bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a water-like geometry to two N atoms. Both Ge–N bond lengths are 1.90 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to seven Ba and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.54 Å. There are two inequivalent N sites. In the first N site, N is bonded to five Ba and one Ge atom to form a mixture of distorted face, edge, and corner-sharing NBa5Ge octahedra. The corner-sharing octahedra tilt angles range from 44–59°. In the second N site, N is bonded to five Ba and one Ge atom to form a mixture of distorted face, edge, and corner-sharing NBa5Ge octahedra. The corner-sharing octahedra tilt angles range from 44–59°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2Mg3Si4 by Materials Project

Ba2Mg3Si4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a 7-coordinate geometry to five Mg and nine Si atoms. There are a spread of Ba–Mg bond distances ranging from 3.45–3.83 Å. There are a spread of Ba–Si bond distances ranging from 3.41–3.53 Å. In the second Ba site, Ba is bonded in a 8-coordinate geometry to eight Mg and eight Si atoms. There are a spread of Ba–Mg bond distances ranging from 3.60–3.73 Å. There are a spread of Ba–Si bond distances ranging from 3.43–3.58 Å. There are three inequivalent Mg sites. In the first Mg site, Mg is bonded to four Ba and four Si atoms to form a mixture of corner, edge, and face-sharing MgBa4Si4 tetrahedra. There are three shorter (2.77 Å) and one longer (2.80 Å) Mg–Si bond lengths. In the second Mg site, Mg is bonded in a 12-coordinate geometry to five Ba and five Si atoms. There are a spread of Mg–Si bond distances ranging from 2.74–2.88 Å. In the third Mg site, Mg is bonded to four equivalent Ba and four Si atoms to form a mixture of distorted corner, edge, and face-sharing MgBa4Si4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.78–2.81 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to four Ba, four Mg, and one Si atom. The Si–Si bond length is 2.44 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to five equivalent Ba, two equivalent Mg, and two Si atoms. There are one shorter (2.42 Å) and one longer (2.44 Å) Si–Si bond lengths. In the third Si site, Si is bonded in a 9-coordinate geometry to four equivalent Ba, four Mg, and one Si atom. The Si–Si bond length is 2.50 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to four Ba, three Mg, and two Si atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba16Nb5N19 by Materials Project

Ba16Nb5N19 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are sixteen inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of Ba–N bond distances ranging from 2.74–3.22 Å. In the second Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of Ba–N bond distances ranging from 2.81–3.24 Å. In the third Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.67–3.28 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.78–3.23 Å. In the fifth Ba2+ site, Ba2+ is bonded to five N3- atoms to form distorted BaN5 trigonal bipyramids that share a cornercorner with one BaN5 square pyramid, corners with five NbN4 tetrahedra, and an edgeedge with one BaN5 square pyramid. There are a spread of Ba–N bond distances ranging from 2.63–3.17 Å. In the sixth Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of Ba–N bond distances ranging from 2.74–3.10 Å. In the seventh Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of Ba–N bond distances ranging from 2.73–3.34 Å. In the eighth Ba2+ site, Ba2+ is bonded in a 3-coordinate geometry to four N3- atoms. There are a spread of Ba–N bond distances ranging from 2.62–3.23 Å. In the ninth Ba2+ site, Ba2+ is bonded in a 4-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.70–3.45 Å. In the tenth Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.71–3.10 Å. In the eleventh Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.71–3.16 Å. In the twelfth Ba2+ site, Ba2+ is bonded to five N3- atoms to form distorted BaN5 square pyramids that share a cornercorner with one NbN4 tetrahedra, a cornercorner with one BaN5 trigonal bipyramid, edges with two NbN4 tetrahedra, and an edgeedge with one BaN5 trigonal bipyramid. There are a spread of Ba–N bond distances ranging from 2.64–2.91 Å. In the thirteenth Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of Ba–N bond distances ranging from 2.78–3.31 Å. In the fourteenth Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.85–3.17 Å. In the fifteenth Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Ba–N bond distances ranging from 2.61–3.25 Å. In the sixteenth Ba2+ site, Ba2+ is bonded to five N3- atoms to form distorted BaN5 trigonal bipyramids that share corners with five NbN4 tetrahedra. There are a spread of Ba–N bond distances ranging from 2.73–3.04 Å. There are five inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to four N3- atoms to form NbN4 tetrahedra that share a cornercorner with one NbN4 tetrahedra, corners with two BaN5 trigonal bipyramids, and an edgeedge with one BaN5 square pyramid. There are a spread of Nb–N bond distances ranging from 1.95–2.04 Å. In the second Nb5+ site, Nb5+ is bonded to four N3- atoms to form NbN4 tetrahedra that share a cornercorner with one NbN4 tetrahedra and a cornercorner with one BaN5 trigonal bipyramid. There are a spread of Nb–N bond distances ranging from 1.94–2.04 Å. In the third Nb5+ site, Nb5+ is bonded to four N3- atoms to form NbN4 tetrahedra that share a cornercorner with one BaN5 square pyramid and corners with three BaN5 trigonal bipyramids. There are a spread of Nb–N bond distances ranging from 1.98–2.00 Å. In the fourth Nb5+ site, Nb5+ is bonded to four N3- atoms to form NbN4 tetrahedra that share corners with two BaN5 trigonal bipyramids. There are a spread of Nb–N bond distances ranging from 1.95–2.00 Å. In the fifth Nb5+ site, Nb5+ is bonded to four N3- atoms to form NbN4 tetrahedra that share corners with two BaN5 trigonal bipyramids and an edgeedge with one BaN5 square pyramid. There are a spread of Nb–N bond distances ranging from 1.98–2.00 Å. There are nineteen inequivalent N3- sites. In the first N3- site, N3- is bonded in a 5-coordinate geometry to three Ba2+ and two Nb5+ atoms. In the second N3- site, N3- is bonded in a distorted octahedral geometry to five Ba2+ and one Nb5+ atom. In the third N3- site, N3- is bonded in a 5-coordinate geometry to four Ba2+ and one Nb5+ atom. In the fourth N3- site, N3- is bonded in a 6-coordinate geometry to five Ba2+ and one Nb5+ atom. In the fifth N3- site, N3- is bonded in a 5-coordinate geometry to four Ba2+ and one Nb5+ atom. In the sixth N3- site, N3- is bonded in a 1-coordinate geometry to four Ba2+ and one Nb5+ atom. In the seventh N3- site, N3- is bonded in a 4-coordinate geometry to three Ba2+ and one Nb5+ atom. In the eighth N3- site, N3- is bonded in a 6-coordinate geometry to five Ba2+ and one Nb5+ atom. In the ninth N3- site, N3- is bonded in a 5-coordinate geometry to four Ba2+ and one Nb5+ atom. In the tenth N3- site, N3- is bonded in a 6-coordinate geometry to five Ba2+ and one Nb5+ atom. In the eleventh N3- site, N3- is bonded in a 5-coordinate geometry to four Ba2+ and one Nb5+ atom. In the twelfth N3- site, N3- is bonded in a 6-coordinate geometry to five Ba2+ and one Nb5+ atom. In the thirteenth N3- site, N3- is bonded in a 1-coordinate geometry to five Ba2+ and one Nb5+ atom. In the fourteenth N3- site, N3- is bonded in a 1-coordinate geometry to five Ba2+ and one Nb5+ atom. In the fifteenth N3- site, N3- is bonded in a 1-coordinate geometry to four Ba2+ and one Nb5+ atom. In the sixteenth N3- site, N3- is bonded in a 6-coordinate geometry to five Ba2+ and one Nb5+ atom. In the seventeenth N3- site, N3- is bonded in a 5-coordinate geometry to four Ba2+ and one Nb5+ atom. In the eighteenth N3- site, N3- is bonded in a 6-coordinate geometry to five Ba2+ and one Nb5+ atom. In the nineteenth N3- site, N3- is bonded in a 1-coordinate geometry to five Ba2+ and one Nb5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba8Ga7 by Materials Project

Ba8Ga7 crystallizes in the cubic P2_13 space group. The structure is three-dimensional. there are four inequivalent Ba sites. In the first Ba site, Ba is bonded in a 6-coordinate geometry to six Ga atoms. There are three shorter (3.55 Å) and three longer (3.57 Å) Ba–Ga bond lengths. In the second Ba site, Ba is bonded in a 6-coordinate geometry to six Ga atoms. There are three shorter (3.59 Å) and three longer (3.64 Å) Ba–Ga bond lengths. In the third Ba site, Ba is bonded in a 5-coordinate geometry to five Ga atoms. There are a spread of Ba–Ga bond distances ranging from 3.42–3.70 Å. In the fourth Ba site, Ba is bonded in a 6-coordinate geometry to six Ga atoms. There are a spread of Ba–Ga bond distances ranging from 3.43–3.69 Å. There are three inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to six Ba and three equivalent Ga atoms. All Ga–Ga bond lengths are 2.79 Å. In the second Ga site, Ga is bonded in a 9-coordinate geometry to six Ba and three Ga atoms. Both Ga–Ga bond lengths are 2.72 Å. In the third Ga site, Ga is bonded in a 9-coordinate geometry to seven Ba and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.67 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba5Mg18Si13 by Materials Project

Ba5Mg18Si13 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a 8-coordinate geometry to eight Mg and eight Si atoms. There are a spread of Ba–Mg bond distances ranging from 3.55–3.84 Å. There are a spread of Ba–Si bond distances ranging from 3.38–3.57 Å. In the second Ba site, Ba is bonded in a 6-coordinate geometry to nine Mg and six equivalent Si atoms. There are six shorter (3.67 Å) and three longer (3.71 Å) Ba–Mg bond lengths. All Ba–Si bond lengths are 3.46 Å. There are four inequivalent Mg sites. In the first Mg site, Mg is bonded to three Ba and four Si atoms to form distorted MgBa3Si4 tetrahedra that share corners with nine MgBa3Si4 tetrahedra, edges with six MgBa3Si4 tetrahedra, and faces with five MgBa2Si4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.75–2.83 Å. In the second Mg site, Mg is bonded to two equivalent Ba and four Si atoms to form a mixture of distorted face, edge, and corner-sharing MgBa2Si4 tetrahedra. There are two shorter (2.68 Å) and two longer (2.78 Å) Mg–Si bond lengths. In the third Mg site, Mg is bonded to three Ba and four Si atoms to form a mixture of distorted face, edge, and corner-sharing MgBa3Si4 tetrahedra. There are a spread of Mg–Si bond distances ranging from 2.77–2.83 Å. In the fourth Mg site, Mg is bonded in a distorted single-bond geometry to five Si atoms. There are one shorter (2.73 Å) and four longer (3.16 Å) Mg–Si bond lengths. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to two equivalent Ba and seven Mg atoms. In the second Si site, Si is bonded in a 9-coordinate geometry to two equivalent Ba and seven Mg atoms. In the third Si site, Si is bonded in a 9-coordinate geometry to six equivalent Ba and three equivalent Si atoms. All Si–Si bond lengths are 2.42 Å. In the fourth Si site, Si is bonded in a 9-coordinate geometry to four equivalent Ba, four Mg, and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba12Na15Li8N6 by Materials Project

Na15Li8Ba12N6 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are four inequivalent Na sites. In the first Na site, Na is bonded in a 10-coordinate geometry to five Na and five Ba atoms. There are a spread of Na–Na bond distances ranging from 3.60–3.84 Å. There are a spread of Na–Ba bond distances ranging from 4.24–4.41 Å. In the second Na site, Na is bonded in a 11-coordinate geometry to five Na and six Ba atoms. There are a spread of Na–Na bond distances ranging from 3.75–3.87 Å. There are a spread of Na–Ba bond distances ranging from 4.16–4.45 Å. In the third Na site, Na is bonded in a distorted q6 geometry to six Na and three equivalent Ba atoms. All Na–Ba bond lengths are 4.32 Å. In the fourth Na site, Na is bonded to six equivalent Na and six equivalent Ba atoms to form NaBa6Na6 cuboctahedra that share corners with six equivalent NBa3Li3 octahedra. The corner-sharing octahedral tilt angles are 43°. All Na–Ba bond lengths are 4.33 Å. There are two inequivalent Li sites. In the first Li site, Li is bonded in a trigonal planar geometry to three equivalent N atoms. All Li–N bond lengths are 2.10 Å. In the second Li site, Li is bonded in a bent 150 degrees geometry to two equivalent N atoms. Both Li–N bond lengths are 2.04 Å. There are two inequivalent Ba sites. In the first Ba site, Ba is bonded in an L-shaped geometry to five Na and two equivalent N atoms. Both Ba–N bond lengths are 2.73 Å. In the second Ba site, Ba is bonded in a single-bond geometry to eight Na and one N atom. The Ba–N bond length is 2.50 Å. N is bonded to three Li and three Ba atoms to form distorted NBa3Li3 octahedra that share a cornercorner with one NaBa6Na6 cuboctahedra, corners with two equivalent NBa3Li3 octahedra, and edges with two equivalent NBa3Li3 octahedra. The corner-sharing octahedral tilt angles are 41°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba5Al5Pb by Materials Project

Ba5Al5Pb crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a 9-coordinate geometry to six Al and three equivalent Pb atoms. There are three shorter (3.74 Å) and three longer (3.79 Å) Ba–Al bond lengths. All Ba–Pb bond lengths are 4.19 Å. In the second Ba site, Ba is bonded in a 1-coordinate geometry to nine Al and one Pb atom. There are three shorter (3.53 Å) and six longer (3.61 Å) Ba–Al bond lengths. The Ba–Pb bond length is 3.70 Å. In the third Ba site, Ba is bonded to two equivalent Al and three equivalent Pb atoms to form corner-sharing BaAl2Pb3 trigonal bipyramids. Both Ba–Al bond lengths are 3.63 Å. All Ba–Pb bond lengths are 3.53 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to seven Ba and three equivalent Al atoms. All Al–Al bond lengths are 2.74 Å. In the second Al site, Al is bonded in a distorted q6 geometry to six Ba and four Al atoms. Both Al–Al bond lengths are 2.84 Å. Pb is bonded to eleven Ba atoms to form distorted face-sharing PbBa11 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba5Ga5Sn by Materials Project

Ba5Ga5Sn crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a 4-coordinate geometry to nine Ga and one Sn atom. There are three shorter (3.51 Å) and six longer (3.57 Å) Ba–Ga bond lengths. The Ba–Sn bond length is 3.64 Å. In the second Ba site, Ba is bonded in a 9-coordinate geometry to six Ga and three equivalent Sn atoms. There are three shorter (3.65 Å) and three longer (3.76 Å) Ba–Ga bond lengths. All Ba–Sn bond lengths are 4.15 Å. In the third Ba site, Ba is bonded to two equivalent Ga and three equivalent Sn atoms to form corner-sharing BaGa2Sn3 trigonal bipyramids. Both Ba–Ga bond lengths are 3.59 Å. All Ba–Sn bond lengths are 3.51 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a distorted q6 geometry to six Ba and four Ga atoms. There are two shorter (2.71 Å) and two longer (2.77 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 10-coordinate geometry to seven Ba and three equivalent Ga atoms. Sn is bonded to eleven Ba atoms to form distorted face-sharing SnBa11 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba6Ge25 by Materials Project

Ba6Ge25 crystallizes in the cubic P4_132 space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a 10-coordinate geometry to nineteen Ge atoms. There are a spread of Ba–Ge bond distances ranging from 3.45–3.75 Å. In the second Ba site, Ba is bonded in a 2-coordinate geometry to twelve Ge atoms. There are a spread of Ba–Ge bond distances ranging from 3.40–3.99 Å. In the third Ba site, Ba is bonded in a distorted body-centered cubic geometry to eight Ge atoms. There are six shorter (3.48 Å) and two longer (3.99 Å) Ba–Ge bond lengths. There are six inequivalent Ge sites. In the first Ge site, Ge is bonded in a 6-coordinate geometry to two equivalent Ba and four Ge atoms. There are two shorter (2.53 Å) and two longer (2.63 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded in a 7-coordinate geometry to four Ba and three equivalent Ge atoms. All Ge–Ge bond lengths are 2.60 Å. In the third Ge site, Ge is bonded in a 5-coordinate geometry to three Ba and three Ge atoms. There are one shorter (2.59 Å) and one longer (2.60 Å) Ge–Ge bond lengths. In the fourth Ge site, Ge is bonded in a distorted trigonal bipyramidal geometry to one Ba and four Ge atoms. The Ge–Ge bond length is 2.55 Å. In the fifth Ge site, Ge is bonded in a 8-coordinate geometry to four Ba and four Ge atoms. There are one shorter (2.52 Å) and one longer (2.61 Å) Ge–Ge bond lengths. In the sixth Ge site, Ge is bonded in a distorted body-centered cubic geometry to four Ba and four Ge atoms. The Ge–Ge bond length is 2.64 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba7Al10 by Materials Project

Ba7Al10 is Tungsten boride-like structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are four inequivalent Ba sites. In the first Ba site, Ba is bonded in a 4-coordinate geometry to seven Al atoms. There are a spread of Ba–Al bond distances ranging from 3.63–3.67 Å. In the second Ba site, Ba is bonded in a 3-coordinate geometry to nine Al atoms. There are three shorter (3.50 Å) and six longer (3.59 Å) Ba–Al bond lengths. In the third Ba site, Ba is bonded in a 4-coordinate geometry to ten Al atoms. There are a spread of Ba–Al bond distances ranging from 3.44–3.59 Å. In the fourth Ba site, Ba is bonded in a 6-coordinate geometry to six equivalent Al atoms. All Ba–Al bond lengths are 3.85 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 9-coordinate geometry to five Ba and four Al atoms. There are a spread of Al–Al bond distances ranging from 2.80–2.90 Å. In the second Al site, Al is bonded in a 10-coordinate geometry to seven Ba and three equivalent Al atoms. In the third Al site, Al is bonded in a distorted q6 geometry to seven Ba and three equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba5Ga5Pb by Materials Project

Ba5Ga5Pb crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a 1-coordinate geometry to nine Ga and one Pb atom. There are three shorter (3.54 Å) and six longer (3.57 Å) Ba–Ga bond lengths. The Ba–Pb bond length is 3.62 Å. In the second Ba site, Ba is bonded in a 9-coordinate geometry to six Ga and three equivalent Pb atoms. There are three shorter (3.58 Å) and three longer (3.78 Å) Ba–Ga bond lengths. All Ba–Pb bond lengths are 4.19 Å. In the third Ba site, Ba is bonded to two equivalent Ga and three equivalent Pb atoms to form corner-sharing BaGa2Pb3 trigonal bipyramids. Both Ba–Ga bond lengths are 3.56 Å. All Ba–Pb bond lengths are 3.54 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to seven Ba and three equivalent Ga atoms. All Ga–Ga bond lengths are 2.71 Å. In the second Ga site, Ga is bonded in a distorted q6 geometry to six Ba and four Ga atoms. Both Ga–Ga bond lengths are 2.76 Å. Pb is bonded to eleven Ba atoms to form distorted face-sharing PbBa11 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba8Co7O19 by Materials Project

Ba8Co7O19 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are sixteen inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.79–3.15 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.79–2.99 Å. In the third Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.59–3.28 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.52–3.19 Å. In the fifth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.76–3.30 Å. In the sixth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.63–2.97 Å. In the seventh Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.59–3.13 Å. In the eighth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.59–3.13 Å. In the ninth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.68–3.22 Å. In the tenth Ba2+ site, Ba2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ba–O bond distances ranging from 2.57–2.97 Å. In the eleventh Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.58–3.18 Å. In the twelfth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.62–2.94 Å. In the thirteenth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.62–3.03 Å. In the fourteenth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.61–3.05 Å. In the fifteenth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.76–3.09 Å. In the sixteenth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.70–3.21 Å. There are fourteen inequivalent Co+3.14+ sites. In the first Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form distorted edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.75–2.03 Å. In the second Co+3.14+ site, Co+3.14+ is bonded to six O2- atoms to form face-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.88–2.20 Å. In the third Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form a mixture of distorted face and edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.84–2.23 Å. In the fourth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form a mixture of face and edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.83–2.15 Å. In the fifth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form CoO5 trigonal bipyramids that share an edgeedge with one CoO5 trigonal bipyramid and a faceface with one CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.88–2.10 Å. In the sixth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form distorted edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.79–2.15 Å. In the seventh Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form a mixture of face and edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.83–2.17 Å. In the eighth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share an edgeedge with one CoO5 trigonal bipyramid and a faceface with one CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.86–2.17 Å. In the ninth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form CoO5 trigonal bipyramids that share an edgeedge with one CoO5 trigonal bipyramid and a faceface with one CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.86–2.05 Å. In the tenth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form a mixture of face and edge-sharing CoO5 trigonal bipyramids. There are a spread of Co–O bond distances ranging from 1.86–2.16 Å. In the eleventh Co+3.14+ site, Co+3.14+ is bonded to six O2- atoms to form face-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.83–2.19 Å. In the twelfth Co+3.14+ site, Co+3.14+ is bonded in a distorted see-saw-like geometry to four O2- atoms. There are a spread of Co–O bond distances ranging from 1.85–2.01 Å. In the thirteenth Co+3.14+ site, Co+3.14+ is bonded to six O2- atoms to form distorted face-sharing CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.75–2.24 Å. In the fourteenth Co+3.14+ site, Co+3.14+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share an edgeedge with one CoO5 trigonal bipyramid and a faceface with one CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.88–2.34 Å. There are thirty-eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and one Co+3.14+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the fourth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the tenth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the eleventh O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the twelfth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the thirteenth O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the fourteenth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the fifteenth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the sixteenth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the seventeenth O2- site, O2- is bonded in a distorted trigonal bipyramidal geometry to three Ba2+ and two Co+3.14+ atoms. In the eighteenth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the nineteenth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the twentieth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the twenty-first O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one Co+3.14+ atom. In the twenty-third O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the twenty-fourth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the twenty-fifth O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one Co+3.14+ atom. In the twenty-sixth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the twenty-seventh O2- site, O2- is bonded in a 1-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the twenty-eighth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the twenty-ninth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the thirtieth O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the thirty-first O2- site, O2- is bonded in a 1-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the thirty-second O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the thirty-third O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms. In the thirty-fourth O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the thirty-fifth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the thirty-sixth O2- site, O2- is bonded in a 6-coordinate geometry to four Ba2+ and two Co+3.14+ atoms. In the thirty-seventh O2- site, O2- is bonded in a distorted single-bond geometry to four Ba2+ and one Co+3.14+ atom. In the thirty-eighth O2- site, O2- is bonded in a 5-coordinate geometry to three Ba2+ and two Co+3.14+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba4Na3Nd3P6(O12F)2 by Materials Project

Ba4Nd3Na3(PO4)6F2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.45–2.63 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.43–2.66 Å. In the third Na1+ site, Na1+ is bonded to four O2- and one F1- atom to form distorted NaO4F trigonal pyramids that share corners with four PO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.31–2.60 Å. The Na–F bond length is 3.20 Å. In the fourth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–3.02 Å. In the fifth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.46–2.60 Å. In the sixth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.42–2.67 Å. There are eight inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to seven O2- and two F1- atoms. There are a spread of Ba–O bond distances ranging from 2.68–3.02 Å. There are one shorter (2.91 Å) and one longer (2.92 Å) Ba–F bond lengths. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to seven O2- and two F1- atoms. There are a spread of Ba–O bond distances ranging from 2.66–3.04 Å. There are one shorter (2.88 Å) and one longer (2.95 Å) Ba–F bond lengths. In the third Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to seven O2- and two F1- atoms. There are a spread of Ba–O bond distances ranging from 2.58–3.04 Å. There are one shorter (2.80 Å) and one longer (2.87 Å) Ba–F bond lengths. In the fourth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to seven O2- and two F1- atoms. There are a spread of Ba–O bond distances ranging from 2.58–3.03 Å. There are one shorter (2.82 Å) and one longer (2.85 Å) Ba–F bond lengths. In the fifth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to seven O2- and two F1- atoms. There are a spread of Ba–O bond distances ranging from 2.59–3.04 Å. There are one shorter (3.13 Å) and one longer (3.31 Å) Ba–F bond lengths. In the sixth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- and one F1- atom. There are a spread of Ba–O bond distances ranging from 2.62–3.27 Å. The Ba–F bond length is 2.96 Å. In the seventh Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to seven O2- and one F1- atom. There are a spread of Ba–O bond distances ranging from 2.62–3.00 Å. The Ba–F bond length is 2.98 Å. In the eighth Ba2+ site, Ba2+ is bonded in a 4-coordinate geometry to seven O2- and two F1- atoms. There are a spread of Ba–O bond distances ranging from 2.61–3.03 Å. There are one shorter (3.12 Å) and one longer (3.33 Å) Ba–F bond lengths. There are six inequivalent Nd3+ sites. In the first Nd3+ site, Nd3+ is bonded in a 7-coordinate geometry to five O2- and two F1- atoms. There are a spread of Nd–O bond distances ranging from 2.37–2.60 Å. There are one shorter (2.38 Å) and one longer (2.63 Å) Nd–F bond lengths. In the second Nd3+ site, Nd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Nd–O bond distances ranging from 2.42–2.68 Å. In the third Nd3+ site, Nd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Nd–O bond distances ranging from 2.41–2.74 Å. In the fourth Nd3+ site, Nd3+ is bonded in a 8-coordinate geometry to six O2- and two F1- atoms. There are a spread of Nd–O bond distances ranging from 2.38–2.78 Å. There are one shorter (2.38 Å) and one longer (2.62 Å) Nd–F bond lengths. In the fifth Nd3+ site, Nd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Nd–O bond distances ranging from 2.41–2.65 Å. In the sixth Nd3+ site, Nd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Nd–O bond distances ranging from 2.43–2.69 Å. There are twelve inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one NaO4F trigonal pyramid. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the second P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is one shorter (1.55 Å) and three longer (1.56 Å) P–O bond length. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one NaO4F trigonal pyramid. There is three shorter (1.55 Å) and one longer (1.57 Å) P–O bond length. In the fourth P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the fifth P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the sixth P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.54–1.58 Å. In the seventh P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the eighth P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. In the ninth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one NaO4F trigonal pyramid. There are a spread of P–O bond distances ranging from 1.55–1.57 Å. In the tenth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one NaO4F trigonal pyramid. All P–O bond lengths are 1.56 Å. In the eleventh P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. In the twelfth P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. There are forty-eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, two Ba2+, one P5+, and one F1- atom. The O–F bond length is 3.07 Å. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, one P5+, and one F1- atom. The O–F bond length is 2.91 Å. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two Nd3+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted tetrahedral geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Nd3+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Nd3+, and one P5+ atom. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Nd3+, and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Nd3+, and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, one Nd3+, and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+, two Nd3+, and one P5+ atom. In the fifteenth O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Nd3+, one P5+, and one F1- atom. The O–F bond length is 2.91 Å. In the sixteenth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, two Ba2+, and one P5+ atom. In the seventeenth O2- site, O2- is bonded in a distorted tetrahedral geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the eighteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the nineteenth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, one Nd3+, and one P5+ atom. In the twentieth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, one Nd3+, and one P5+ atom. In the twenty-first O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the twenty-second O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the twenty-third O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+, one P5+, and one F1- atom. The O–F bond length is 3.06 Å. In the twenty-fourth O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+, one P5+, and one F1- atom. The O–F bond length is 3.00 Å. In the twenty-fifth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, one P5+, and one F1- atom. The O–F bond length is 2.83 Å. In the twenty-sixth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, one P5+, and one F1- atom. The O–F bond length is 2.80 Å. In the twenty-seventh O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Nd3+, and one P5+ atom. In the twenty-eighth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the twenty-ninth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, two Nd3+, and one P5+ atom. In the thirtieth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the thirty-first O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, two Nd3+, and one P5+ atom. In the thirty-second O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the thirty-third O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+, one P5+, and one F1- atom. The O–F bond length is 3.16 Å. In the thirty-fourth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, one Nd3+, one P5+, and one F1- atom. The O–F bond length is 2.72 Å. In the thirty-fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, one Nd3+, and one P5+ atom. In the thirty-sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+, one Nd3+, and one P5+ atom. In the thirty-seventh O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the thirty-eighth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the thirty-ninth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the fortieth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the forty-first O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the forty-second O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the forty-third O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Ba2+, one Nd3+, and one P5+ atom. In the forty-fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+, two Nd3+, and one P5+ atom. In the forty-fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, one Nd3+, and one P5+ atom. In the forty-sixth O2- site, O

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba7SrCoCu7O24 by Materials Project

Ba7SrCoCu7O24 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded to twelve O atoms to form BaO12 cuboctahedra that share corners with four equivalent SrO12 cuboctahedra, corners with eight equivalent BaO12 cuboctahedra, faces with six BaO12 cuboctahedra, a faceface with one CoO6 octahedra, and faces with seven CuO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.81–2.89 Å. In the second Ba site, Ba is bonded to twelve O atoms to form BaO12 cuboctahedra that share corners with twelve BaO12 cuboctahedra, faces with two equivalent SrO12 cuboctahedra, faces with four equivalent BaO12 cuboctahedra, a faceface with one CoO6 octahedra, and faces with seven CuO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.81–2.84 Å. In the third Ba site, Ba is bonded to twelve O atoms to form BaO12 cuboctahedra that share corners with twelve equivalent BaO12 cuboctahedra, faces with six equivalent BaO12 cuboctahedra, a faceface with one CoO6 octahedra, and faces with seven CuO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.82–2.84 Å. Sr is bonded to twelve O atoms to form SrO12 cuboctahedra that share corners with twelve equivalent BaO12 cuboctahedra, faces with six equivalent BaO12 cuboctahedra, a faceface with one CoO6 octahedra, and faces with seven CuO6 octahedra. There are a spread of Sr–O bond distances ranging from 2.74–2.80 Å. Co is bonded to six O atoms to form CoO6 octahedra that share corners with six equivalent CuO6 octahedra, a faceface with one SrO12 cuboctahedra, and faces with seven BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–2°. There is three shorter (1.93 Å) and three longer (1.94 Å) Co–O bond length. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded to six O atoms to form CuO6 octahedra that share corners with six CuO6 octahedra, a faceface with one SrO12 cuboctahedra, and faces with seven BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–4°. There are two shorter (2.00 Å) and four longer (2.01 Å) Cu–O bond lengths. In the second Cu site, Cu is bonded to six O atoms to form CuO6 octahedra that share corners with two equivalent CoO6 octahedra, corners with four equivalent CuO6 octahedra, a faceface with one SrO12 cuboctahedra, and faces with seven BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–4°. There are four shorter (1.99 Å) and two longer (2.06 Å) Cu–O bond lengths. In the third Cu site, Cu is bonded to six O atoms to form CuO6 octahedra that share corners with six equivalent CuO6 octahedra, a faceface with one SrO12 cuboctahedra, and faces with seven BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–4°. There is three shorter (1.99 Å) and three longer (2.00 Å) Cu–O bond length. There are six inequivalent O sites. In the first O site, O is bonded to four Ba and two Cu atoms to form a mixture of distorted corner, edge, and face-sharing OBa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 2–60°. In the second O site, O is bonded to four Ba and two Cu atoms to form a mixture of distorted corner, edge, and face-sharing OBa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 1–62°. In the third O site, O is bonded to four Ba, one Co, and one Cu atom to form a mixture of distorted corner, edge, and face-sharing OBa4CoCu octahedra. The corner-sharing octahedra tilt angles range from 2–62°. In the fourth O site, O is bonded to three Ba, one Sr, and two Cu atoms to form distorted OBa3SrCu2 octahedra that share corners with fourteen OBa4Cu2 octahedra, edges with four equivalent OBa3SrCu2 octahedra, and faces with eight OBa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 2–60°. In the fifth O site, O is bonded to three Ba, one Sr, and two Cu atoms to form distorted OBa3SrCu2 octahedra that share corners with twenty OBa4Cu2 octahedra, edges with two equivalent OBa3SrCu2 octahedra, and faces with seven OBa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 1–62°. In the sixth O site, O is bonded in a distorted linear geometry to three Ba, one Sr, one Co, and one Cu atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2Sr2CoCu3O10 by Materials Project

Ba2Sr2CoCu3O10 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are sixteen inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–3.21 Å. In the second Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.66–3.17 Å. In the third Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.71–2.96 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.67–2.92 Å. In the fifth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–2.95 Å. In the sixth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.70–3.22 Å. In the seventh Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.70–2.92 Å. In the eighth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.66–3.01 Å. In the ninth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.72–3.12 Å. In the tenth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–2.98 Å. In the eleventh Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.72–3.13 Å. In the twelfth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–2.95 Å. In the thirteenth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.71–3.21 Å. In the fourteenth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.66–3.03 Å. In the fifteenth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.72–3.16 Å. In the sixteenth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.67–3.32 Å. There are sixteen inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.57–2.91 Å. In the second Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.55–3.07 Å. In the third Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.51–3.06 Å. In the fourth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.58–3.01 Å. In the fifth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.53–2.98 Å. In the sixth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.57–3.16 Å. In the seventh Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.55–3.07 Å. In the eighth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.52–2.90 Å. In the ninth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.56–2.99 Å. In the tenth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.54–3.14 Å. In the eleventh Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.56–2.99 Å. In the twelfth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.51–3.15 Å. In the thirteenth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.53–2.98 Å. In the fourteenth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.50–3.06 Å. In the fifteenth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.56–2.99 Å. In the sixteenth Sr2+ site, Sr2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sr–O bond distances ranging from 2.52–2.90 Å. There are eight inequivalent Co4+ sites. In the first Co4+ site, Co4+ is bonded to six O2- atoms to form distorted CoO6 octahedra that share a cornercorner with one CoO6 octahedra, a cornercorner with one CuO6 octahedra, corners with two CoO5 square pyramids, a cornercorner with one CuO4 tetrahedra, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 3–4°. There are a spread of Co–O bond distances ranging from 1.85–2.48 Å. In the second Co4+ site, Co4+ is bonded to six O2- atoms to form distorted CoO6 octahedra that share a cornercorner with one CoO6 octahedra, a cornercorner with one CuO6 octahedra, corners with two CoO5 square pyramids, and corners with two CuO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 1–5°. There are a spread of Co–O bond distances ranging from 1.84–2.56 Å. In the third Co4+ site, Co4+ is bonded to six O2- atoms to form distorted CoO6 octahedra that share a cornercorner with one CoO6 octahedra, a cornercorner with one CuO6 octahedra, corners with two CoO5 square pyramids, a cornercorner with one CuO4 tetrahedra, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–4°. There are a spread of Co–O bond distances ranging from 1.83–2.55 Å. In the fourth Co4+ site, Co4+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CuO6 octahedra and corners with two CuO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 3–5°. There are a spread of Co–O bond distances ranging from 1.88–2.24 Å. In the fifth Co4+ site, Co4+ is bonded to six O2- atoms to form CoO6 octahedra that share a cornercorner with one CoO6 octahedra, a cornercorner with one CuO6 octahedra, corners with two CoO5 square pyramids, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–4°. There are a spread of Co–O bond distances ranging from 1.86–2.43 Å. In the sixth Co4+ site, Co4+ is bonded to five O2- atoms to form distorted CoO5 square pyramids that share corners with four CoO6 octahedra and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 4–10°. There are a spread of Co–O bond distances ranging from 1.83–2.08 Å. In the seventh Co4+ site, Co4+ is bonded to five O2- atoms to form distorted CoO5 square pyramids that share corners with four CoO6 octahedra and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–9°. There are a spread of Co–O bond distances ranging from 1.83–2.04 Å. In the eighth Co4+ site, Co4+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with four CoO6 octahedra and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 1–4°. There are a spread of Co–O bond distances ranging from 2.07–2.31 Å. There are twenty-four inequivalent Cu+2.67+ sites. In the first Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with four CuO6 octahedra and a cornercorner with one CuO4 tetrahedra. The corner-sharing octahedra tilt angles range from 3–6°. There are a spread of Cu–O bond distances ranging from 1.97–2.33 Å. In the second Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with four CuO6 octahedra and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–5°. There are a spread of Cu–O bond distances ranging from 1.97–2.21 Å. In the third Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with four CuO6 octahedra and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–5°. There are a spread of Cu–O bond distances ranging from 1.96–2.29 Å. In the fourth Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share corners with four CoO6 octahedra and a cornercorner with one CuO4 tetrahedra. The corner-sharing octahedra tilt angles range from 2–5°. There are a spread of Cu–O bond distances ranging from 2.10–2.35 Å. In the fifth Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share a cornercorner with one CoO6 octahedra, corners with three CuO6 octahedra, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–6°. There are a spread of Cu–O bond distances ranging from 1.97–2.27 Å. In the sixth Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share a cornercorner with one CoO6 octahedra, corners with three CuO6 octahedra, a cornercorner with one CuO4 tetrahedra, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 2–5°. There are a spread of Cu–O bond distances ranging from 1.97–2.29 Å. In the seventh Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share a cornercorner with one CoO6 octahedra, corners with three CuO6 octahedra, and corners with two CuO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 3–6°. There are a spread of Cu–O bond distances ranging from 1.97–2.23 Å. In the eighth Cu+2.67+ site, Cu+2.67+ is bonded to six O2- atoms to form CuO6 octahedra that share a cornercorner with one CoO6 octahedra, corners with three CuO6 octahedra, a cornercorner with one CuO4 tetrahedra, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 3–5°. There are a spread of Cu–O bond distances ranging from 1.96–2.40 Å. In the ninth Cu+2.67+ site, Cu+2.67+ is bonded to four O2- atoms to form distorted CuO4 trigonal pyramids that share a cornercorner with one CoO6 octahedra, a cornercorner with one CuO6 octahedra, and a cornercorner with one CuO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 14–22°. There are a spread of Cu–O bond distances ranging from 1.84–1.90 Å. In the tenth Cu+2.67+ site, Cu+2.67+ is bonded to four O2- atoms to form CuO4 tetrahedra that share corners with two CuO6 octahedra and corners with two CuO4 tetrahedra. The corner-sharing octahedra tilt angles range from 17–22°. There are a spread of Cu–O bond distances ranging from 1.85–1.93 Å. In the eleventh Cu+2.67+ site, Cu+2.67+ is bonded to four O2- atoms to form CuO4 trigonal pyramids that share a cornercorner with one CoO6 octahedra and a cornercorner with one CuO6 octahedra. The corner-sharing octahedra tilt angles range from 17–18°. There are a spread of Cu–O bond distances ranging from 1.83–1.92 Å. In the twelfth Cu+2.67+ site, Cu+2.67+ is bonded to four O2- atoms to form distorted CuO4 trigonal pyramids that share a cornercorner with one CuO6 octahedra,

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaClO3 by Materials Project

BaO3Cl crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a 4-coordinate geometry to six O and one Cl atom. There are a spread of Ba–O bond distances ranging from 2.64–3.05 Å. The Ba–Cl bond length is 3.38 Å. In the second Ba site, Ba is bonded in a 4-coordinate geometry to four O and four Cl atoms. There are a spread of Ba–O bond distances ranging from 2.70–2.86 Å. There are a spread of Ba–Cl bond distances ranging from 3.19–3.67 Å. There are six inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two equivalent Ba and one O atom. The O–O bond length is 1.30 Å. In the second O site, O is bonded in a trigonal planar geometry to two equivalent Ba and one O atom. The O–O bond length is 1.38 Å. In the third O site, O is bonded in a distorted water-like geometry to two O atoms. The O–O bond length is 1.42 Å. In the fourth O site, O is bonded in a distorted trigonal planar geometry to two equivalent Ba and one O atom. In the fifth O site, O is bonded in a distorted trigonal planar geometry to two equivalent Ba and one Cl atom. The O–Cl bond length is 1.67 Å. In the sixth O site, O is bonded in a 3-coordinate geometry to two equivalent Ba and one O atom. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a 1-coordinate geometry to one Ba and one O atom. In the second Cl site, Cl is bonded to four Ba atoms to form distorted corner-sharing ClBa4 trigonal pyramids.

36 MATERIALS SCIENCE↗