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DOE OSTI2020

Materials Data on Hf5NiSb3 by Materials Project

Hf5NiSb3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 6-coordinate geometry to two equivalent Hf and six equivalent Sb atoms. Both Hf–Hf bond lengths are 2.87 Å. All Hf–Sb bond lengths are 3.02 Å. In the second Hf site, Hf is bonded to two equivalent Ni and five equivalent Sb atoms to form a mixture of distorted corner, edge, and face-sharing HfNi2Sb5 pentagonal bipyramids. Both Hf–Ni bond lengths are 2.63 Å. There are a spread of Hf–Sb bond distances ranging from 2.93–3.08 Å. Ni is bonded to six equivalent Hf atoms to form face-sharing NiHf6 octahedra. Sb is bonded in a 9-coordinate geometry to nine Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHf4(NCl)4 by Materials Project

NaHf4(NCl)4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Na is bonded to six Cl atoms to form edge-sharing NaCl6 octahedra. There are four shorter (2.76 Å) and two longer (2.80 Å) Na–Cl bond lengths. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are one shorter (2.13 Å) and three longer (2.14 Å) Hf–N bond lengths. There are two shorter (2.86 Å) and one longer (2.92 Å) Hf–Cl bond lengths. In the second Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are a spread of Hf–N bond distances ranging from 2.11–2.13 Å. There are one shorter (2.86 Å) and two longer (2.94 Å) Hf–Cl bond lengths. There are two inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with four equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, an edgeedge with one ClNa2Hf3 square pyramid, and edges with three NHf4 trigonal pyramids. In the second N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with two equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with two equivalent ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms. In the second Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with two equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with three equivalent ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHf3(NCl)3 by Materials Project

NaHf3(NCl)3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Na is bonded to six Cl atoms to form NaCl6 octahedra that share corners with six HfN4Cl3 trigonal pyramids, edges with three equivalent NaCl6 octahedra, and edges with six HfN4Cl3 trigonal pyramids. All Na–Cl bond lengths are 2.80 Å. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded to four N and three Cl atoms to form distorted HfN4Cl3 trigonal pyramids that share corners with two equivalent NaCl6 octahedra, edges with two equivalent NaCl6 octahedra, and edges with nine HfN4Cl3 trigonal pyramids. The corner-sharing octahedral tilt angles are 3°. There are a spread of Hf–N bond distances ranging from 2.11–2.13 Å. There are one shorter (2.93 Å) and two longer (2.96 Å) Hf–Cl bond lengths. In the second Hf site, Hf is bonded to four N and three Cl atoms to form distorted HfN4Cl3 trigonal pyramids that share corners with two equivalent NaCl6 octahedra, edges with two equivalent NaCl6 octahedra, and edges with nine HfN4Cl3 trigonal pyramids. The corner-sharing octahedral tilt angles are 3°. There are a spread of Hf–N bond distances ranging from 2.11–2.13 Å. There are one shorter (2.93 Å) and two longer (2.95 Å) Hf–Cl bond lengths. There are two inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with six ClNa2Hf3 square pyramids, corners with six equivalent NHf4 trigonal pyramids, edges with three ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. In the second N site, N is bonded to four Hf atoms to form NHf4 trigonal pyramids that share corners with six ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with three ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with six ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with five ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids. In the second Cl site, Cl is bonded to two equivalent Na and three Hf atoms to form distorted ClNa2Hf3 square pyramids that share corners with six equivalent ClNa2Hf3 square pyramids, corners with six NHf4 trigonal pyramids, edges with five ClNa2Hf3 square pyramids, and edges with three NHf4 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf5Al3C by Materials Project

Hf5Al3C crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 2-coordinate geometry to five equivalent Al and two equivalent C atoms. There are a spread of Hf–Al bond distances ranging from 2.85–3.20 Å. Both Hf–C bond lengths are 2.32 Å. In the second Hf site, Hf is bonded in a 6-coordinate geometry to two equivalent Hf and six equivalent Al atoms. Both Hf–Hf bond lengths are 2.84 Å. All Hf–Al bond lengths are 2.86 Å. Al is bonded in a 9-coordinate geometry to nine Hf atoms. C is bonded to six equivalent Hf atoms to form face-sharing CHf6 octahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2Be17 by Materials Project

Be17Hf2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are four inequivalent Be sites. In the first Be site, Be is bonded in a 2-coordinate geometry to thirteen Be and one Hf atom. There are a spread of Be–Be bond distances ranging from 2.09–2.39 Å. The Be–Hf bond length is 2.59 Å. In the second Be site, Be is bonded to ten Be and two equivalent Hf atoms to form BeHf2Be10 cuboctahedra that share corners with twenty-two BeHf2Be10 cuboctahedra, edges with ten BeHf3Be9 cuboctahedra, and faces with eighteen BeHf2Be10 cuboctahedra. There are four shorter (2.14 Å) and four longer (2.17 Å) Be–Be bond lengths. Both Be–Hf bond lengths are 2.82 Å. In the third Be site, Be is bonded to ten Be and two Hf atoms to form a mixture of distorted face, edge, and corner-sharing BeHf2Be10 cuboctahedra. There are a spread of Be–Be bond distances ranging from 2.13–2.34 Å. There are one shorter (2.67 Å) and one longer (2.69 Å) Be–Hf bond lengths. In the fourth Be site, Be is bonded to nine Be and three Hf atoms to form a mixture of distorted face, edge, and corner-sharing BeHf3Be9 cuboctahedra. Both Be–Be bond lengths are 2.14 Å. There are a spread of Be–Hf bond distances ranging from 2.74–2.87 Å. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 12-coordinate geometry to eighteen Be atoms. In the second Hf site, Hf is bonded in a 8-coordinate geometry to twenty Be atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaHf6(NCl)6 by Materials Project

NaHf6(NCl)6 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Na is bonded in an octahedral geometry to six Cl atoms. All Na–Cl bond lengths are 2.77 Å. There are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are three shorter (2.12 Å) and one longer (2.13 Å) Hf–N bond lengths. All Hf–Cl bond lengths are 2.83 Å. In the second Hf site, Hf is bonded in a 4-coordinate geometry to four N and three Cl atoms. There are three shorter (2.12 Å) and one longer (2.13 Å) Hf–N bond lengths. All Hf–Cl bond lengths are 2.84 Å. There are two inequivalent N sites. In the first N site, N is bonded to four Hf atoms to form a mixture of corner and edge-sharing NHf4 trigonal pyramids. In the second N site, N is bonded to four Hf atoms to form a mixture of corner and edge-sharing NHf4 trigonal pyramids. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms. In the second Cl site, Cl is bonded in a distorted see-saw-like geometry to one Na and three Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2CuSi4 by Materials Project

Hf2CuSi4 is Parent of FeAs superconductors-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 10-coordinate geometry to ten Si atoms. There are a spread of Hf–Si bond distances ranging from 2.70–2.97 Å. In the second Hf site, Hf is bonded to four equivalent Cu and eight Si atoms to form distorted HfCu4Si8 cuboctahedra that share corners with four equivalent HfCu4Si8 cuboctahedra, edges with four equivalent HfCu4Si8 cuboctahedra, edges with eight equivalent CuHf4Cu4Si4 cuboctahedra, faces with four equivalent HfCu4Si8 cuboctahedra, and faces with four equivalent CuHf4Cu4Si4 cuboctahedra. There are two shorter (3.01 Å) and two longer (3.02 Å) Hf–Cu bond lengths. There are four shorter (2.73 Å) and four longer (2.77 Å) Hf–Si bond lengths. Cu is bonded to four equivalent Hf, four equivalent Cu, and four equivalent Si atoms to form CuHf4Cu4Si4 cuboctahedra that share corners with four equivalent CuHf4Cu4Si4 cuboctahedra, edges with eight equivalent HfCu4Si8 cuboctahedra, faces with four equivalent HfCu4Si8 cuboctahedra, and faces with eight equivalent CuHf4Cu4Si4 cuboctahedra. All Cu–Cu bond lengths are 2.60 Å. All Cu–Si bond lengths are 2.41 Å. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 8-coordinate geometry to six equivalent Hf and two equivalent Si atoms. Both Si–Si bond lengths are 2.42 Å. In the second Si site, Si is bonded in a 8-coordinate geometry to four Hf and four equivalent Si atoms. All Si–Si bond lengths are 2.60 Å. In the third Si site, Si is bonded in a 8-coordinate geometry to four Hf and four equivalent Si atoms. In the fourth Si site, Si is bonded in a 8-coordinate geometry to four equivalent Hf and four equivalent Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3(NiGe)4 by Materials Project

Hf3Ni4Ge4 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 12-coordinate geometry to six equivalent Ni and six Ge atoms. All Hf–Ni bond lengths are 2.84 Å. There are two shorter (2.84 Å) and four longer (2.87 Å) Hf–Ge bond lengths. In the second Hf site, Hf is bonded to eight equivalent Ni and six Ge atoms to form face-sharing HfNi8Ge6 octahedra. All Hf–Ni bond lengths are 3.28 Å. There are two shorter (2.75 Å) and four longer (2.77 Å) Hf–Ge bond lengths. Ni is bonded in a 12-coordinate geometry to five Hf, three equivalent Ni, and four Ge atoms. There are one shorter (2.61 Å) and two longer (2.79 Å) Ni–Ni bond lengths. There are a spread of Ni–Ge bond distances ranging from 2.38–2.41 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to three Hf and six equivalent Ni atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to six Hf, two equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf9V4S by Materials Project

Hf9V4S crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a distorted single-bond geometry to four V and one S atom. There are a spread of Hf–V bond distances ranging from 2.86–3.03 Å. The Hf–S bond length is 2.64 Å. In the second Hf site, Hf is bonded in a distorted T-shaped geometry to two equivalent V and one S atom. Both Hf–V bond lengths are 2.92 Å. The Hf–S bond length is 3.13 Å. There are two inequivalent V sites. In the first V site, V is bonded to six equivalent Hf and six equivalent V atoms to form face-sharing VHf6V6 cuboctahedra. All V–V bond lengths are 2.64 Å. In the second V site, V is bonded to eight Hf and four V atoms to form distorted VHf8V4 cuboctahedra that share corners with four equivalent VHf8V4 cuboctahedra and faces with eight VHf6V6 cuboctahedra. Both V–V bond lengths are 2.75 Å. S is bonded in a 6-coordinate geometry to nine Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf5Si4 by Materials Project

Hf5Si4 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. there are three inequivalent Hf sites. In the first Hf site, Hf is bonded to six Si atoms to form corner-sharing HfSi6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Hf–Si bond distances ranging from 2.71–2.84 Å. In the second Hf site, Hf is bonded in a 7-coordinate geometry to seven Si atoms. There are a spread of Hf–Si bond distances ranging from 2.73–3.09 Å. In the third Hf site, Hf is bonded in a 6-coordinate geometry to six Si atoms. There are a spread of Hf–Si bond distances ranging from 2.61–2.76 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to eight Hf and one Si atom. The Si–Si bond length is 2.50 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to eight Hf and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf9BMo4 by Materials Project

BHf9Mo4 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 1-coordinate geometry to four Mo and one B atom. There are a spread of Hf–Mo bond distances ranging from 2.94–3.10 Å. The Hf–B bond length is 2.54 Å. In the second Hf site, Hf is bonded in a 3-coordinate geometry to two equivalent Mo and one B atom. Both Hf–Mo bond lengths are 2.86 Å. The Hf–B bond length is 3.07 Å. There are two inequivalent Mo sites. In the first Mo site, Mo is bonded to six equivalent Hf and six equivalent Mo atoms to form face-sharing MoHf6Mo6 cuboctahedra. All Mo–Mo bond lengths are 2.69 Å. In the second Mo site, Mo is bonded in a 12-coordinate geometry to eight Hf and four Mo atoms. Both Mo–Mo bond lengths are 2.86 Å. B is bonded in a 6-coordinate geometry to nine Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3P2 by Materials Project

Hf3P2 is Stibnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are three inequivalent Hf sites. In the first Hf site, Hf is bonded in a 4-coordinate geometry to five P atoms. There are a spread of Hf–P bond distances ranging from 2.63–3.08 Å. In the second Hf site, Hf is bonded to five P atoms to form edge-sharing HfP5 square pyramids. There are a spread of Hf–P bond distances ranging from 2.61–2.66 Å. In the third Hf site, Hf is bonded in a 5-coordinate geometry to five P atoms. There are a spread of Hf–P bond distances ranging from 2.63–2.74 Å. There are two inequivalent P sites. In the first P site, P is bonded to seven Hf atoms to form a mixture of distorted edge and corner-sharing PHf7 pentagonal bipyramids. In the second P site, P is bonded in a 8-coordinate geometry to eight Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3N2O3 by Materials Project

Hf3N2O3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Hf4+ sites. In the first Hf4+ site, Hf4+ is bonded to two N3- and four O2- atoms to form distorted HfN2O4 octahedra that share corners with four HfN2O4 octahedra and edges with six HfN3O3 octahedra. The corner-sharing octahedra tilt angles range from 28–41°. There are one shorter (2.07 Å) and one longer (2.19 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.05–2.24 Å. In the second Hf4+ site, Hf4+ is bonded to three N3- and three O2- atoms to form distorted HfN3O3 octahedra that share corners with four HfN3O3 octahedra and edges with six HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 26–58°. There are two shorter (2.10 Å) and one longer (2.19 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.09–2.31 Å. In the third Hf4+ site, Hf4+ is bonded to three N3- and three O2- atoms to form distorted HfN3O3 octahedra that share corners with four HfN3O3 octahedra and edges with six HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 21–58°. There are one shorter (2.04 Å) and two longer (2.14 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.03–2.39 Å. In the fourth Hf4+ site, Hf4+ is bonded to two N3- and four O2- atoms to form a mixture of distorted corner and edge-sharing HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 21–35°. Both Hf–N bond lengths are 2.15 Å. There are a spread of Hf–O bond distances ranging from 2.10–2.12 Å. In the fifth Hf4+ site, Hf4+ is bonded to three N3- and three O2- atoms to form a mixture of distorted corner and edge-sharing HfN3O3 octahedra. The corner-sharing octahedra tilt angles range from 28–57°. There are two shorter (2.11 Å) and one longer (2.18 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.09–2.42 Å. In the sixth Hf4+ site, Hf4+ is bonded to two N3- and four O2- atoms to form a mixture of distorted corner and edge-sharing HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 28–57°. There are one shorter (2.04 Å) and one longer (2.22 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.09–2.25 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 trigonal pyramids that share a cornercorner with one OHf4 trigonal pyramid, corners with two equivalent NHf4 trigonal pyramids, and edges with two equivalent NHf4 trigonal pyramids. In the second N3- site, N3- is bonded in a 3-coordinate geometry to three Hf4+ atoms. In the third N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 tetrahedra that share corners with two equivalent NHf4 tetrahedra, a cornercorner with one NHf4 trigonal pyramid, and edges with two equivalent OHf4 trigonal pyramids. In the fourth N3- site, N3- is bonded to four Hf4+ atoms to form a mixture of distorted corner and edge-sharing NHf4 trigonal pyramids. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to four Hf4+ atoms to form distorted OHf4 trigonal pyramids that share a cornercorner with one NHf4 trigonal pyramid, corners with two equivalent OHf4 trigonal pyramids, and edges with two equivalent NHf4 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to four Hf4+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to three Hf4+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to four Hf4+ atoms. In the fifth O2- site, O2- is bonded in a distorted T-shaped geometry to three Hf4+ atoms. In the sixth O2- site, O2- is bonded in a distorted T-shaped geometry to three Hf4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2N2O by Materials Project

Hf2ON2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are six inequivalent Hf4+ sites. In the first Hf4+ site, Hf4+ is bonded to four N3- and two equivalent O2- atoms to form distorted HfN4O2 octahedra that share corners with two equivalent HfN2O4 octahedra and edges with three HfN4O2 octahedra. The corner-sharing octahedral tilt angles are 5°. There are a spread of Hf–N bond distances ranging from 2.06–2.13 Å. Both Hf–O bond lengths are 2.49 Å. In the second Hf4+ site, Hf4+ is bonded in a 7-coordinate geometry to four N3- and three O2- atoms. There are a spread of Hf–N bond distances ranging from 2.17–2.40 Å. There are two shorter (2.18 Å) and one longer (2.43 Å) Hf–O bond lengths. In the third Hf4+ site, Hf4+ is bonded in a 7-coordinate geometry to six N3- and one O2- atom. There are a spread of Hf–N bond distances ranging from 2.09–2.41 Å. The Hf–O bond length is 2.71 Å. In the fourth Hf4+ site, Hf4+ is bonded in a 7-coordinate geometry to five N3- and two O2- atoms. There are a spread of Hf–N bond distances ranging from 2.13–2.30 Å. There are one shorter (2.19 Å) and one longer (2.67 Å) Hf–O bond lengths. In the fifth Hf4+ site, Hf4+ is bonded in a 7-coordinate geometry to five N3- and two O2- atoms. There are a spread of Hf–N bond distances ranging from 2.12–2.39 Å. There are one shorter (2.20 Å) and one longer (2.33 Å) Hf–O bond lengths. In the sixth Hf4+ site, Hf4+ is bonded to two N3- and four O2- atoms to form a mixture of corner and edge-sharing HfN2O4 octahedra. The corner-sharing octahedral tilt angles are 5°. There are one shorter (2.06 Å) and one longer (2.16 Å) Hf–N bond lengths. There are two shorter (2.05 Å) and two longer (2.27 Å) Hf–O bond lengths. There are six inequivalent N3- sites. In the first N3- site, N3- is bonded in a 4-coordinate geometry to four Hf4+ atoms. In the second N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 tetrahedra that share corners with two equivalent NHf4 tetrahedra, a cornercorner with one OHf4 trigonal pyramid, corners with two equivalent NHf4 trigonal pyramids, and edges with two equivalent NHf4 tetrahedra. In the third N3- site, N3- is bonded in a 5-coordinate geometry to five Hf4+ atoms. In the fourth N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 trigonal pyramids that share corners with three NHf4 tetrahedra, corners with two equivalent NHf4 trigonal pyramids, and edges with two equivalent OHf4 trigonal pyramids. In the fifth N3- site, N3- is bonded in a 5-coordinate geometry to five Hf4+ atoms. In the sixth N3- site, N3- is bonded to four Hf4+ atoms to form NHf4 tetrahedra that share corners with two equivalent NHf4 tetrahedra, a cornercorner with one NHf4 trigonal pyramid, corners with two equivalent OHf4 trigonal pyramids, and edges with two equivalent NHf4 tetrahedra. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four Hf4+ atoms to form distorted OHf4 trigonal pyramids that share corners with three NHf4 tetrahedra, corners with two equivalent OHf4 trigonal pyramids, and edges with two equivalent NHf4 trigonal pyramids. In the second O2- site, O2- is bonded in a 4-coordinate geometry to four Hf4+ atoms. In the third O2- site, O2- is bonded in a 6-coordinate geometry to six Hf4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3N2O3 by Materials Project

Hf3N2O3 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are six inequivalent Hf4+ sites. In the first Hf4+ site, Hf4+ is bonded to two N3- and four O2- atoms to form a mixture of distorted edge and corner-sharing HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 28–52°. There are one shorter (2.12 Å) and one longer (2.19 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.08–2.22 Å. In the second Hf4+ site, Hf4+ is bonded to four N3- and two O2- atoms to form a mixture of distorted edge and corner-sharing HfN4O2 octahedra. The corner-sharing octahedra tilt angles range from 25–52°. There are a spread of Hf–N bond distances ranging from 2.11–2.25 Å. There are one shorter (2.08 Å) and one longer (2.18 Å) Hf–O bond lengths. In the third Hf4+ site, Hf4+ is bonded to two N3- and four O2- atoms to form a mixture of distorted edge and corner-sharing HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 24–36°. There are one shorter (2.12 Å) and one longer (2.19 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.07–2.13 Å. In the fourth Hf4+ site, Hf4+ is bonded to three N3- and three O2- atoms to form a mixture of distorted edge and corner-sharing HfN3O3 octahedra. The corner-sharing octahedra tilt angles range from 25–40°. There are one shorter (2.11 Å) and two longer (2.16 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.06–2.29 Å. In the fifth Hf4+ site, Hf4+ is bonded to three N3- and three O2- atoms to form distorted HfN3O3 octahedra that share corners with four HfN2O4 octahedra and edges with six HfN4O2 octahedra. The corner-sharing octahedra tilt angles range from 24–58°. There are two shorter (2.12 Å) and one longer (2.16 Å) Hf–N bond lengths. There are a spread of Hf–O bond distances ranging from 2.06–2.32 Å. In the sixth Hf4+ site, Hf4+ is bonded to two equivalent N3- and four O2- atoms to form a mixture of distorted edge and corner-sharing HfN2O4 octahedra. The corner-sharing octahedra tilt angles range from 24–58°. Both Hf–N bond lengths are 2.13 Å. There are a spread of Hf–O bond distances ranging from 2.00–2.27 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 tetrahedra that share corners with two equivalent NHf4 tetrahedra, corners with two NHf4 trigonal pyramids, and edges with two equivalent OHf4 trigonal pyramids. In the second N3- site, N3- is bonded to four Hf4+ atoms to form a mixture of distorted edge and corner-sharing NHf4 trigonal pyramids. In the third N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 trigonal pyramids that share a cornercorner with one NHf4 tetrahedra, corners with three NHf4 trigonal pyramids, edges with two equivalent NHf4 trigonal pyramids, and edges with two equivalent OHf4 trigonal pyramids. In the fourth N3- site, N3- is bonded to four Hf4+ atoms to form distorted NHf4 trigonal pyramids that share a cornercorner with one OHf4 trigonal pyramid, corners with two equivalent NHf4 trigonal pyramids, and edges with four NHf4 trigonal pyramids. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to three Hf4+ atoms. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to three Hf4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Hf4+ atoms. In the fourth O2- site, O2- is bonded in a distorted T-shaped geometry to three Hf4+ atoms. In the fifth O2- site, O2- is bonded to four Hf4+ atoms to form distorted OHf4 trigonal pyramids that share a cornercorner with one NHf4 trigonal pyramid, corners with two equivalent OHf4 trigonal pyramids, edges with two equivalent NHf4 tetrahedra, and edges with two equivalent NHf4 trigonal pyramids. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to four Hf4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Si3Ni2 by Materials Project

Hf3Ni2Si3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 5-coordinate geometry to four equivalent Ni and five Si atoms. All Hf–Ni bond lengths are 2.96 Å. There are a spread of Hf–Si bond distances ranging from 2.71–2.91 Å. In the second Hf site, Hf is bonded in a 2-coordinate geometry to four equivalent Ni and six Si atoms. There are a spread of Hf–Ni bond distances ranging from 2.84–3.04 Å. There are a spread of Hf–Si bond distances ranging from 2.71–2.84 Å. Ni is bonded in a 10-coordinate geometry to six Hf and four Si atoms. There are a spread of Ni–Si bond distances ranging from 2.28–2.40 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to seven Hf and two equivalent Ni atoms. In the second Si site, Si is bonded in a 9-coordinate geometry to five Hf, three equivalent Ni, and one Si atom. The Si–Si bond length is 2.44 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf9AsW4 by Materials Project

Hf9W4As crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 2-coordinate geometry to four W and one As atom. There are a spread of Hf–W bond distances ranging from 2.88–3.11 Å. The Hf–As bond length is 2.74 Å. In the second Hf site, Hf is bonded in a distorted T-shaped geometry to two equivalent W and one As atom. Both Hf–W bond lengths are 2.92 Å. The Hf–As bond length is 3.12 Å. There are two inequivalent W sites. In the first W site, W is bonded to six equivalent Hf and six equivalent W atoms to form face-sharing WHf6W6 cuboctahedra. All W–W bond lengths are 2.74 Å. In the second W site, W is bonded in a 12-coordinate geometry to eight Hf and four W atoms. Both W–W bond lengths are 2.87 Å. As is bonded in a 9-coordinate geometry to nine Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Bi by Materials Project

Hf3Bi is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded to eight Hf and four equivalent Bi atoms to form distorted HfHf8Bi4 cuboctahedra that share corners with twelve equivalent HfHf8Bi4 cuboctahedra, edges with eight equivalent HfHf8Bi4 cuboctahedra, edges with eight equivalent BiHf12 cuboctahedra, faces with four equivalent BiHf12 cuboctahedra, and faces with ten equivalent HfHf8Bi4 cuboctahedra. There are four shorter (3.11 Å) and four longer (3.24 Å) Hf–Hf bond lengths. All Hf–Bi bond lengths are 3.24 Å. In the second Hf site, Hf is bonded in a distorted square co-planar geometry to eight equivalent Hf and four equivalent Bi atoms. All Hf–Bi bond lengths are 3.11 Å. Bi is bonded to twelve Hf atoms to form BiHf12 cuboctahedra that share corners with four equivalent BiHf12 cuboctahedra, edges with eight equivalent BiHf12 cuboctahedra, edges with sixteen equivalent HfHf8Bi4 cuboctahedra, faces with four equivalent BiHf12 cuboctahedra, and faces with eight equivalent HfHf8Bi4 cuboctahedra.

36 MATERIALS SCIENCE↗