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DOE OSTI2020

Materials Data on K2In12Se19 by Materials Project

K2In12Se19 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are three shorter (3.51 Å) and three longer (3.60 Å) K–Se bond lengths. In the second K1+ site, K1+ is bonded in a 3-coordinate geometry to six Se2- atoms. There are three shorter (3.36 Å) and three longer (3.77 Å) K–Se bond lengths. There are four inequivalent In3+ sites. In the first In3+ site, In3+ is bonded to four Se2- atoms to form corner-sharing InSe4 tetrahedra. There are a spread of In–Se bond distances ranging from 2.59–2.75 Å. In the second In3+ site, In3+ is bonded to four Se2- atoms to form corner-sharing InSe4 tetrahedra. There are a spread of In–Se bond distances ranging from 2.58–2.74 Å. In the third In3+ site, In3+ is bonded to four Se2- atoms to form corner-sharing InSe4 tetrahedra. There are a spread of In–Se bond distances ranging from 2.56–2.70 Å. In the fourth In3+ site, In3+ is bonded to four Se2- atoms to form a mixture of edge and corner-sharing InSe4 tetrahedra. There are a spread of In–Se bond distances ranging from 2.62–2.69 Å. There are seven inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted trigonal planar geometry to one K1+ and two In3+ atoms. In the second Se2- site, Se2- is bonded to one K1+ and three In3+ atoms to form a mixture of distorted edge and corner-sharing SeKIn3 trigonal pyramids. In the third Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to three In3+ atoms. In the fourth Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to three equivalent In3+ atoms. In the fifth Se2- site, Se2- is bonded in a trigonal non-coplanar geometry to three In3+ atoms. In the sixth Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to one K1+ and two equivalent In3+ atoms. In the seventh Se2- site, Se2- is bonded in a 3-coordinate geometry to one K1+ and two equivalent In3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CuSe2 by Materials Project

CuSe2 is Pyrite structured and crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Cu3+ is bonded to six equivalent Se+1.50- atoms to form CuSe6 octahedra that share corners with twelve equivalent CuSe6 octahedra and corners with six equivalent SeCu3Se tetrahedra. The corner-sharing octahedral tilt angles are 65°. All Cu–Se bond lengths are 2.58 Å. Se+1.50- is bonded to three equivalent Cu3+ and one Se+1.50- atom to form distorted SeCu3Se tetrahedra that share corners with three equivalent CuSe6 octahedra and corners with fifteen equivalent SeCu3Se tetrahedra. The corner-sharing octahedral tilt angles are 77°. The Se–Se bond length is 2.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nb3Se12I by Materials Project

(NbSe4)3I crystallizes in the tetragonal P4/mnc space group. The structure is three-dimensional. there are two inequivalent Nb+4.33+ sites. In the first Nb+4.33+ site, Nb+4.33+ is bonded in a 8-coordinate geometry to eight Se1- atoms. There are four shorter (2.60 Å) and four longer (2.77 Å) Nb–Se bond lengths. In the second Nb+4.33+ site, Nb+4.33+ is bonded to eight Se1- atoms to form distorted face-sharing NbSe8 hexagonal bipyramids. There are a spread of Nb–Se bond distances ranging from 2.66–2.75 Å. There are four inequivalent Se1- sites. In the first Se1- site, Se1- is bonded in a 2-coordinate geometry to two Nb+4.33+ atoms. In the second Se1- site, Se1- is bonded in a 2-coordinate geometry to two equivalent Nb+4.33+ and one Se1- atom. The Se–Se bond length is 2.36 Å. In the third Se1- site, Se1- is bonded in a 2-coordinate geometry to two equivalent Nb+4.33+, one Se1-, and two equivalent I1- atoms. Both Se–I bond lengths are 4.06 Å. In the fourth Se1- site, Se1- is bonded in a 2-coordinate geometry to two Nb+4.33+ and one I1- atom. The Se–I bond length is 3.39 Å. I1- is bonded in a 4-coordinate geometry to eight Se1- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlRe6Se8Cl3 by Materials Project

Re6TlSe8Cl3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are six inequivalent Re3+ sites. In the first Re3+ site, Re3+ is bonded to four Se2- and one Cl1- atom to form a mixture of corner and edge-sharing ReSe4Cl square pyramids. There are a spread of Re–Se bond distances ranging from 2.52–2.56 Å. The Re–Cl bond length is 2.44 Å. In the second Re3+ site, Re3+ is bonded to five Se2- atoms to form a mixture of corner and edge-sharing ReSe5 square pyramids. There are a spread of Re–Se bond distances ranging from 2.54–2.67 Å. In the third Re3+ site, Re3+ is bonded to five Se2- atoms to form a mixture of corner and edge-sharing ReSe5 square pyramids. There are a spread of Re–Se bond distances ranging from 2.54–2.66 Å. In the fourth Re3+ site, Re3+ is bonded to five Se2- atoms to form ReSe5 square pyramids that share corners with three ReSe4Cl square pyramids and edges with five ReSe5 square pyramids. There are a spread of Re–Se bond distances ranging from 2.53–2.66 Å. In the fifth Re3+ site, Re3+ is bonded to four Se2- and one Cl1- atom to form ReSe4Cl square pyramids that share corners with two ReSe5 square pyramids and edges with four ReSe4Cl square pyramids. There are one shorter (2.54 Å) and three longer (2.55 Å) Re–Se bond lengths. The Re–Cl bond length is 2.43 Å. In the sixth Re3+ site, Re3+ is bonded to four Se2- and one Cl1- atom to form ReSe4Cl square pyramids that share corners with two ReSe5 square pyramids and edges with four ReSe4Cl square pyramids. There are a spread of Re–Se bond distances ranging from 2.53–2.57 Å. The Re–Cl bond length is 2.41 Å. Tl1+ is bonded in a 9-coordinate geometry to five Cl1- atoms. There are a spread of Tl–Cl bond distances ranging from 3.11–3.41 Å. There are eight inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to four Re3+ atoms. In the second Se2- site, Se2- is bonded in a 4-coordinate geometry to four Re3+ atoms. In the third Se2- site, Se2- is bonded in a 4-coordinate geometry to three Re3+ atoms. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to three Re3+ atoms. In the fifth Se2- site, Se2- is bonded in a 9-coordinate geometry to three Re3+ atoms. In the sixth Se2- site, Se2- is bonded in a 4-coordinate geometry to four Re3+ atoms. In the seventh Se2- site, Se2- is bonded in a 5-coordinate geometry to three Re3+ atoms. In the eighth Se2- site, Se2- is bonded in a 7-coordinate geometry to three Re3+ atoms. There are three inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 2-coordinate geometry to one Re3+ and one Tl1+ atom. In the second Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Re3+ and two equivalent Tl1+ atoms. In the third Cl1- site, Cl1- is bonded in a 1-coordinate geometry to one Re3+ and two equivalent Tl1+ atoms.

36 MATERIALS SCIENCE↗
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Materials Data on Tl4SiSe4 by Materials Project

Tl4SiSe4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are five inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a 4-coordinate geometry to four Se2- atoms. There are two shorter (3.05 Å) and two longer (3.34 Å) Tl–Se bond lengths. In the second Tl1+ site, Tl1+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.30–3.70 Å. In the third Tl1+ site, Tl1+ is bonded to five Se2- atoms to form distorted TlSe5 square pyramids that share corners with two equivalent TlSe5 square pyramids, corners with three equivalent SiSe4 tetrahedra, and an edgeedge with one SiSe4 tetrahedra. There are a spread of Tl–Se bond distances ranging from 3.21–3.54 Å. In the fourth Tl1+ site, Tl1+ is bonded in a 4-coordinate geometry to four Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.07–3.43 Å. In the fifth Tl1+ site, Tl1+ is bonded in a 4-coordinate geometry to six Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.14–3.88 Å. Si4+ is bonded to four Se2- atoms to form SiSe4 tetrahedra that share corners with three equivalent TlSe5 square pyramids and an edgeedge with one TlSe5 square pyramid. There are a spread of Si–Se bond distances ranging from 2.30–2.32 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 1-coordinate geometry to four Tl1+ and one Si4+ atom. In the second Se2- site, Se2- is bonded in a 1-coordinate geometry to six Tl1+ and one Si4+ atom. In the third Se2- site, Se2- is bonded to five Tl1+ and one Si4+ atom to form a mixture of distorted edge and corner-sharing SeTl5Si octahedra. The corner-sharing octahedral tilt angles are 0°. In the fourth Se2- site, Se2- is bonded in a 6-coordinate geometry to five Tl1+ and one Si4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tl2PSe3 by Materials Project

Tl2PSe3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.13–3.95 Å. In the second Tl1+ site, Tl1+ is bonded in a 4-coordinate geometry to seven Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.27–3.90 Å. In the third Tl1+ site, Tl1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of Tl–Se bond distances ranging from 3.19–3.79 Å. In the fourth Tl1+ site, Tl1+ is bonded to six Se2- atoms to form distorted edge-sharing TlSe6 pentagonal pyramids. There are a spread of Tl–Se bond distances ranging from 3.23–3.49 Å. There are two inequivalent P4+ sites. In the first P4+ site, P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are one shorter (2.21 Å) and two longer (2.22 Å) P–Se bond lengths. In the second P4+ site, P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of P–Se bond distances ranging from 2.20–2.23 Å. There are six inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 1-coordinate geometry to three Tl1+ and one P4+ atom. In the second Se2- site, Se2- is bonded in a 1-coordinate geometry to five Tl1+ and one P4+ atom. In the third Se2- site, Se2- is bonded in a 1-coordinate geometry to five Tl1+ and one P4+ atom. In the fourth Se2- site, Se2- is bonded in a 1-coordinate geometry to six Tl1+ and one P4+ atom. In the fifth Se2- site, Se2- is bonded in a 1-coordinate geometry to four Tl1+ and one P4+ atom. In the sixth Se2- site, Se2- is bonded in a 1-coordinate geometry to four Tl1+ and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K5GaSe4 by Materials Project

K5GaSe4 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. there are five inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 5-coordinate geometry to five Se2- atoms. There are a spread of K–Se bond distances ranging from 3.23–3.51 Å. In the second K1+ site, K1+ is bonded in a 5-coordinate geometry to six Se2- atoms. There are a spread of K–Se bond distances ranging from 3.28–4.00 Å. In the third K1+ site, K1+ is bonded in a 5-coordinate geometry to five Se2- atoms. There are a spread of K–Se bond distances ranging from 3.21–3.48 Å. In the fourth K1+ site, K1+ is bonded to five Se2- atoms to form distorted KSe5 trigonal bipyramids that share corners with three equivalent GaSe4 tetrahedra, an edgeedge with one GaSe4 tetrahedra, and an edgeedge with one KSe5 trigonal bipyramid. There are a spread of K–Se bond distances ranging from 3.32–3.44 Å. In the fifth K1+ site, K1+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of K–Se bond distances ranging from 3.36–3.89 Å. Ga3+ is bonded to four Se2- atoms to form GaSe4 tetrahedra that share corners with three equivalent KSe5 trigonal bipyramids and an edgeedge with one KSe5 trigonal bipyramid. There are a spread of Ga–Se bond distances ranging from 2.46–2.49 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 1-coordinate geometry to seven K1+ and one Ga3+ atom. In the second Se2- site, Se2- is bonded in a 1-coordinate geometry to seven K1+ and one Ga3+ atom. In the third Se2- site, Se2- is bonded in a 7-coordinate geometry to six K1+ and one Ga3+ atom. In the fourth Se2- site, Se2- is bonded in a 1-coordinate geometry to seven K1+ and one Ga3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Ge2Se5 by Materials Project

K2Ge2Se5 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 5-coordinate geometry to five Se2- atoms. There are a spread of K–Se bond distances ranging from 3.24–3.74 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of K–Se bond distances ranging from 3.46–3.90 Å. In the third K1+ site, K1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of K–Se bond distances ranging from 3.33–3.92 Å. There are three inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four Se2- atoms to form corner-sharing GeSe4 tetrahedra. There are a spread of Ge–Se bond distances ranging from 2.32–2.43 Å. In the second Ge4+ site, Ge4+ is bonded to four Se2- atoms to form corner-sharing GeSe4 tetrahedra. There are a spread of Ge–Se bond distances ranging from 2.30–2.43 Å. In the third Ge4+ site, Ge4+ is bonded to four Se2- atoms to form corner-sharing GeSe4 tetrahedra. There are a spread of Ge–Se bond distances ranging from 2.31–2.41 Å. There are seven inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to two K1+ and two Ge4+ atoms. In the second Se2- site, Se2- is bonded in a water-like geometry to two equivalent Ge4+ atoms. In the third Se2- site, Se2- is bonded to four K1+ and one Ge4+ atom to form distorted SeK4Ge trigonal bipyramids that share corners with three equivalent SeK3Ge tetrahedra and edges with two equivalent SeK4Ge trigonal bipyramids. In the fourth Se2- site, Se2- is bonded in a distorted water-like geometry to one K1+ and two Ge4+ atoms. In the fifth Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to two K1+ and two Ge4+ atoms. In the sixth Se2- site, Se2- is bonded to three K1+ and one Ge4+ atom to form distorted corner-sharing SeK3Ge tetrahedra. In the seventh Se2- site, Se2- is bonded in a 5-coordinate geometry to four K1+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2PSe3 by Materials Project

K2PSe3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six Se2- atoms. There are a spread of K–Se bond distances ranging from 3.37–3.47 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of K–Se bond distances ranging from 3.40–3.92 Å. In the third K1+ site, K1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of K–Se bond distances ranging from 3.36–3.98 Å. In the fourth K1+ site, K1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of K–Se bond distances ranging from 3.36–3.80 Å. There are two inequivalent P4+ sites. In the first P4+ site, P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of P–Se bond distances ranging from 2.20–2.22 Å. In the second P4+ site, P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. All P–Se bond lengths are 2.21 Å. There are six inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to four K1+ and one P4+ atom. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to four K1+ and one P4+ atom. In the third Se2- site, Se2- is bonded in a 1-coordinate geometry to five K1+ and one P4+ atom. In the fourth Se2- site, Se2- is bonded in a 1-coordinate geometry to five K1+ and one P4+ atom. In the fifth Se2- site, Se2- is bonded in a 6-coordinate geometry to five K1+ and one P4+ atom. In the sixth Se2- site, Se2- is bonded in a 1-coordinate geometry to four K1+ and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiInSe2 by Materials Project

LiInSe2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Li1+ is bonded to six Se2- atoms to form LiSe6 octahedra that share corners with two equivalent InSe6 octahedra, corners with four equivalent LiSe6 octahedra, edges with four equivalent LiSe6 octahedra, and edges with eight equivalent InSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. There are four shorter (2.84 Å) and two longer (2.93 Å) Li–Se bond lengths. In3+ is bonded to six Se2- atoms to form InSe6 octahedra that share corners with two equivalent LiSe6 octahedra, corners with four equivalent InSe6 octahedra, edges with four equivalent InSe6 octahedra, and edges with eight equivalent LiSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. There are two shorter (2.69 Å) and four longer (2.84 Å) In–Se bond lengths. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent In3+ atoms to form a mixture of edge and corner-sharing SeLi3In3 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. There are two shorter (2.84 Å) and one longer (2.93 Å) Se–Li bond lengths. There are one shorter (2.69 Å) and two longer (2.84 Å) Se–In bond lengths. In the second Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent In3+ atoms to form a mixture of edge and corner-sharing SeLi3In3 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. In the third Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent In3+ atoms to form a mixture of edge and corner-sharing SeLi3In3 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. In the fourth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent In3+ atoms to form a mixture of edge and corner-sharing SeLi3In3 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. In the fifth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent In3+ atoms to form a mixture of edge and corner-sharing SeLi3In3 octahedra. The corner-sharing octahedra tilt angles range from 0–5°. There are two shorter (2.84 Å) and one longer (2.93 Å) Se–Li bond lengths. There are one shorter (2.69 Å) and two longer (2.84 Å) Se–In bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiSmSe2 by Materials Project

LiSmSe2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Li1+ is bonded to six Se2- atoms to form LiSe6 octahedra that share corners with two equivalent SmSe6 octahedra, corners with four equivalent LiSe6 octahedra, edges with four equivalent LiSe6 octahedra, and edges with eight equivalent SmSe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are four shorter (2.90 Å) and two longer (2.93 Å) Li–Se bond lengths. Sm3+ is bonded to six equivalent Se2- atoms to form SmSe6 octahedra that share corners with two equivalent LiSe6 octahedra, corners with four equivalent SmSe6 octahedra, edges with four equivalent SmSe6 octahedra, and edges with eight equivalent LiSe6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are four shorter (2.90 Å) and two longer (2.92 Å) Sm–Se bond lengths. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Sm3+ atoms to form a mixture of edge and corner-sharing SeLi3Sm3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.90 Å) and one longer (2.93 Å) Se–Li bond lengths. There are two shorter (2.90 Å) and one longer (2.92 Å) Se–Sm bond lengths. In the second Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Sm3+ atoms to form a mixture of edge and corner-sharing SeLi3Sm3 octahedra. The corner-sharing octahedral tilt angles are 0°. In the third Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Sm3+ atoms to form a mixture of edge and corner-sharing SeLi3Sm3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.90 Å) and one longer (2.92 Å) Se–Sm bond lengths. In the fourth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Sm3+ atoms to form a mixture of edge and corner-sharing SeLi3Sm3 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.90 Å) and one longer (2.92 Å) Se–Sm bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiDySe2 by Materials Project

LiDySe2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Li1+ is bonded to six Se2- atoms to form LiSe6 octahedra that share corners with two equivalent DySe6 octahedra, corners with four equivalent LiSe6 octahedra, edges with four equivalent LiSe6 octahedra, and edges with eight equivalent DySe6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are four shorter (2.85 Å) and two longer (2.93 Å) Li–Se bond lengths. Dy3+ is bonded to six Se2- atoms to form DySe6 octahedra that share corners with two equivalent LiSe6 octahedra, corners with four equivalent DySe6 octahedra, edges with four equivalent DySe6 octahedra, and edges with eight equivalent LiSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are four shorter (2.85 Å) and two longer (2.86 Å) Dy–Se bond lengths. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Dy3+ atoms to form a mixture of corner and edge-sharing SeLi3Dy3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.85 Å) and one longer (2.86 Å) Se–Dy bond lengths. In the second Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Dy3+ atoms to form a mixture of corner and edge-sharing SeLi3Dy3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the third Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Dy3+ atoms to form a mixture of corner and edge-sharing SeLi3Dy3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.85 Å) and one longer (2.86 Å) Se–Dy bond lengths. In the fourth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Dy3+ atoms to form a mixture of corner and edge-sharing SeLi3Dy3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the fifth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Dy3+ atoms to form a mixture of corner and edge-sharing SeLi3Dy3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.85 Å) and one longer (2.93 Å) Se–Li bond lengths. There are two shorter (2.85 Å) and one longer (2.86 Å) Se–Dy bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiGdSe2 by Materials Project

LiGdSe2 is Caswellsilverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Li1+ is bonded to six Se2- atoms to form LiSe6 octahedra that share corners with two equivalent GdSe6 octahedra, corners with four equivalent LiSe6 octahedra, edges with four equivalent LiSe6 octahedra, and edges with eight equivalent GdSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are four shorter (2.88 Å) and two longer (2.91 Å) Li–Se bond lengths. Gd3+ is bonded to six Se2- atoms to form GdSe6 octahedra that share corners with two equivalent LiSe6 octahedra, corners with four equivalent GdSe6 octahedra, edges with four equivalent GdSe6 octahedra, and edges with eight equivalent LiSe6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are four shorter (2.88 Å) and two longer (2.89 Å) Gd–Se bond lengths. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Gd3+ atoms to form a mixture of corner and edge-sharing SeLi3Gd3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the second Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Gd3+ atoms to form a mixture of corner and edge-sharing SeLi3Gd3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.88 Å) and one longer (2.89 Å) Se–Gd bond lengths. In the third Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Gd3+ atoms to form a mixture of corner and edge-sharing SeLi3Gd3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the fourth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Gd3+ atoms to form a mixture of corner and edge-sharing SeLi3Gd3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.88 Å) and one longer (2.91 Å) Se–Li bond lengths. There are two shorter (2.88 Å) and one longer (2.89 Å) Se–Gd bond lengths. In the fifth Se2- site, Se2- is bonded to three equivalent Li1+ and three equivalent Gd3+ atoms to form a mixture of corner and edge-sharing SeLi3Gd3 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are two shorter (2.88 Å) and one longer (2.89 Å) Se–Gd bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3(Cu4Se3)2 by Materials Project

K3(Cu4Se3)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of K–Se bond distances ranging from 3.32–3.71 Å. In the second K1+ site, K1+ is bonded in a body-centered cubic geometry to eight Se2- atoms. There are four shorter (3.42 Å) and four longer (3.44 Å) K–Se bond lengths. There are four inequivalent Cu+1.12+ sites. In the first Cu+1.12+ site, Cu+1.12+ is bonded in a 4-coordinate geometry to four Se2- atoms. There are a spread of Cu–Se bond distances ranging from 2.38–2.73 Å. In the second Cu+1.12+ site, Cu+1.12+ is bonded in a trigonal planar geometry to three Se2- atoms. There are two shorter (2.46 Å) and one longer (2.50 Å) Cu–Se bond lengths. In the third Cu+1.12+ site, Cu+1.12+ is bonded in a distorted trigonal non-coplanar geometry to three Se2- atoms. There are one shorter (2.38 Å) and two longer (2.55 Å) Cu–Se bond lengths. In the fourth Cu+1.12+ site, Cu+1.12+ is bonded to four Se2- atoms to form a mixture of corner and edge-sharing CuSe4 tetrahedra. There are a spread of Cu–Se bond distances ranging from 2.49–2.59 Å. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 8-coordinate geometry to four K1+ and four Cu+1.12+ atoms. In the second Se2- site, Se2- is bonded in a 9-coordinate geometry to three equivalent K1+ and six Cu+1.12+ atoms. In the third Se2- site, Se2- is bonded in a 8-coordinate geometry to four K1+ and four Cu+1.12+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(SbSe2)2 by Materials Project

Ba(SbSe2)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of Ba–Se bond distances ranging from 3.34–3.64 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of Ba–Se bond distances ranging from 3.39–3.75 Å. There are four inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing SbSe5 square pyramids. There are a spread of Sb–Se bond distances ranging from 2.64–3.12 Å. In the second Sb3+ site, Sb3+ is bonded to five Se2- atoms to form a mixture of distorted edge and corner-sharing SbSe5 square pyramids. There are a spread of Sb–Se bond distances ranging from 2.60–3.35 Å. In the third Sb3+ site, Sb3+ is bonded to five Se2- atoms to form a mixture of distorted edge and corner-sharing SbSe5 square pyramids. There are a spread of Sb–Se bond distances ranging from 2.61–3.33 Å. In the fourth Sb3+ site, Sb3+ is bonded in a 4-coordinate geometry to four Se2- atoms. There are a spread of Sb–Se bond distances ranging from 2.63–3.40 Å. There are eight inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to two Ba2+ and three Sb3+ atoms. In the second Se2- site, Se2- is bonded in a T-shaped geometry to three Sb3+ atoms. In the third Se2- site, Se2- is bonded in a distorted see-saw-like geometry to two Ba2+ and two Sb3+ atoms. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to one Ba2+ and three Sb3+ atoms. In the fifth Se2- site, Se2- is bonded to four Ba2+ and one Sb3+ atom to form a mixture of distorted edge and corner-sharing SeBa4Sb square pyramids. In the sixth Se2- site, Se2- is bonded to four Ba2+ and one Sb3+ atom to form a mixture of distorted edge and corner-sharing SeBa4Sb trigonal bipyramids. In the seventh Se2- site, Se2- is bonded in a 5-coordinate geometry to two Ba2+ and three Sb3+ atoms. In the eighth Se2- site, Se2- is bonded in a 5-coordinate geometry to two Ba2+ and three Sb3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb(SnSe2)2 by Materials Project

Rb(SnSe2)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of Rb–Se bond distances ranging from 3.48–4.05 Å. In the second Rb1+ site, Rb1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of Rb–Se bond distances ranging from 3.57–4.14 Å. There are four inequivalent Sn+3.50+ sites. In the first Sn+3.50+ site, Sn+3.50+ is bonded to four Se2- atoms to form a mixture of corner and edge-sharing SnSe4 tetrahedra. There are a spread of Sn–Se bond distances ranging from 2.50–2.61 Å. In the second Sn+3.50+ site, Sn+3.50+ is bonded to four Se2- atoms to form corner-sharing SnSe4 tetrahedra. There are a spread of Sn–Se bond distances ranging from 2.54–2.61 Å. In the third Sn+3.50+ site, Sn+3.50+ is bonded to four Se2- atoms to form a mixture of corner and edge-sharing SnSe4 tetrahedra. There are a spread of Sn–Se bond distances ranging from 2.48–2.63 Å. In the fourth Sn+3.50+ site, Sn+3.50+ is bonded in a distorted rectangular see-saw-like geometry to four Se2- atoms. There are a spread of Sn–Se bond distances ranging from 2.77–3.22 Å. There are eight inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to one Rb1+ and two Sn+3.50+ atoms. In the second Se2- site, Se2- is bonded in a 4-coordinate geometry to three Rb1+ and two Sn+3.50+ atoms. In the third Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to two Rb1+ and two Sn+3.50+ atoms. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to three equivalent Rb1+ and two Sn+3.50+ atoms. In the fifth Se2- site, Se2- is bonded in a 3-coordinate geometry to one Rb1+ and two Sn+3.50+ atoms. In the sixth Se2- site, Se2- is bonded in a 5-coordinate geometry to three Rb1+ and two Sn+3.50+ atoms. In the seventh Se2- site, Se2- is bonded in a distorted water-like geometry to one Rb1+ and two Sn+3.50+ atoms. In the eighth Se2- site, Se2- is bonded in a 2-coordinate geometry to one Rb1+ and two Sn+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2Ag(AsSe2)3 by Materials Project

K2Ag(AsSe2)3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to seven Se2- atoms. There are a spread of K–Se bond distances ranging from 3.44–3.60 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.45–3.99 Å. Ag1+ is bonded to four Se2- atoms to form distorted edge-sharing AgSe4 tetrahedra. There are a spread of Ag–Se bond distances ranging from 2.66–2.84 Å. There are three inequivalent As3+ sites. In the first As3+ site, As3+ is bonded in a distorted trigonal non-coplanar geometry to three Se2- atoms. There are one shorter (2.41 Å) and two longer (2.46 Å) As–Se bond lengths. In the second As3+ site, As3+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of As–Se bond distances ranging from 2.38–2.51 Å. In the third As3+ site, As3+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of As–Se bond distances ranging from 2.36–2.50 Å. There are six inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to two K1+ and two As3+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to three K1+, one Ag1+, and one As3+ atom. In the third Se2- site, Se2- is bonded to three K1+ and two As3+ atoms to form distorted SeK3As2 square pyramids that share corners with two equivalent SeK3As2 square pyramids, a cornercorner with one SeK2As2 trigonal pyramid, and an edgeedge with one SeK2As2 trigonal pyramid. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to two K1+, one Ag1+, and one As3+ atom. In the fifth Se2- site, Se2- is bonded to two equivalent K1+ and two As3+ atoms to form distorted SeK2As2 trigonal pyramids that share a cornercorner with one SeK3As2 square pyramid, corners with two equivalent SeK2As2 trigonal pyramids, and an edgeedge with one SeK3As2 square pyramid. In the sixth Se2- site, Se2- is bonded in a 5-coordinate geometry to three K1+, two equivalent Ag1+, and one As3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3La(PSe4)2 by Materials Project

K3La(PSe4)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of K–Se bond distances ranging from 3.38–4.04 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.46–4.11 Å. In the third K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.36–3.95 Å. La3+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of La–Se bond distances ranging from 3.06–3.62 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four Se2- atoms. There are a spread of P–Se bond distances ranging from 2.20–2.25 Å. In the second P5+ site, P5+ is bonded in a tetrahedral geometry to four Se2- atoms. There are a spread of P–Se bond distances ranging from 2.19–2.25 Å. There are eight inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to two K1+, two equivalent La3+, and one P5+ atom. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the third Se2- site, Se2- is bonded in a 1-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to five K1+ and one P5+ atom. In the fifth Se2- site, Se2- is bonded to four K1+ and one P5+ atom to form distorted edge-sharing SeK4P square pyramids. In the sixth Se2- site, Se2- is bonded in a 5-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the seventh Se2- site, Se2- is bonded in a 1-coordinate geometry to two K1+, two equivalent La3+, and one P5+ atom. In the eighth Se2- site, Se2- is bonded in a 1-coordinate geometry to three K1+, two equivalent La3+, and one P5+ atom.

36 MATERIALS SCIENCE↗