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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on FeCu2SnSe4 by Materials Project

Cu2FeSnSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Fe3+ is bonded to four equivalent Se2- atoms to form FeSe4 tetrahedra that share corners with four equivalent SnSe4 tetrahedra and corners with eight equivalent CuSe4 tetrahedra. All Fe–Se bond lengths are 2.41 Å. Cu+1.50+ is bonded to four equivalent Se2- atoms to form CuSe4 tetrahedra that share corners with four equivalent FeSe4 tetrahedra, corners with four equivalent CuSe4 tetrahedra, and corners with four equivalent SnSe4 tetrahedra. All Cu–Se bond lengths are 2.43 Å. Sn2+ is bonded to four equivalent Se2- atoms to form SnSe4 tetrahedra that share corners with four equivalent FeSe4 tetrahedra and corners with eight equivalent CuSe4 tetrahedra. All Sn–Se bond lengths are 2.67 Å. Se2- is bonded to one Fe3+, two equivalent Cu+1.50+, and one Sn2+ atom to form corner-sharing SeFeCu2Sn tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on FeCu2SnSe4 by Materials Project

Cu2FeSnSe4 crystallizes in the trigonal R3m space group. The structure is three-dimensional. Fe3+ is bonded to four Se2- atoms to form FeSe4 tetrahedra that share corners with three equivalent CuSe4 tetrahedra and corners with six equivalent FeSe4 tetrahedra. There are one shorter (2.31 Å) and three longer (2.41 Å) Fe–Se bond lengths. There are two inequivalent Cu+1.50+ sites. In the first Cu+1.50+ site, Cu+1.50+ is bonded to four Se2- atoms to form CuSe4 tetrahedra that share corners with three equivalent FeSe4 tetrahedra and corners with nine CuSe4 tetrahedra. There are one shorter (2.39 Å) and three longer (2.41 Å) Cu–Se bond lengths. In the second Cu+1.50+ site, Cu+1.50+ is bonded to four Se2- atoms to form corner-sharing CuSe4 tetrahedra. There are three shorter (2.37 Å) and one longer (2.50 Å) Cu–Se bond lengths. Sn2+ is bonded in a 4-coordinate geometry to four Se2- atoms. There are three shorter (2.78 Å) and one longer (3.37 Å) Sn–Se bond lengths. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to four Cu+1.50+ atoms to form corner-sharing SeCu4 tetrahedra. In the second Se2- site, Se2- is bonded in a distorted rectangular see-saw-like geometry to one Cu+1.50+ and three equivalent Sn2+ atoms. In the third Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Fe3+ and one Sn2+ atom. In the fourth Se2- site, Se2- is bonded to one Fe3+ and three equivalent Cu+1.50+ atoms to form corner-sharing SeFeCu3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe2Cu3(Sn3Se8)2 by Materials Project

Fe2Cu3(Sn3Se8)2 is beta indium sulfide-derived structured and crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six Se2- atoms to form FeSe6 octahedra that share corners with four CuSe4 tetrahedra and edges with six SnSe6 octahedra. There are a spread of Fe–Se bond distances ranging from 2.41–2.52 Å. In the second Fe3+ site, Fe3+ is bonded to six Se2- atoms to form FeSe6 octahedra that share corners with five CuSe4 tetrahedra and edges with six SnSe6 octahedra. There are a spread of Fe–Se bond distances ranging from 2.40–2.48 Å. There are three inequivalent Cu+1.33+ sites. In the first Cu+1.33+ site, Cu+1.33+ is bonded to four Se2- atoms to form CuSe4 tetrahedra that share corners with three FeSe6 octahedra and corners with nine SnSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–64°. There are a spread of Cu–Se bond distances ranging from 2.41–2.50 Å. In the second Cu+1.33+ site, Cu+1.33+ is bonded to four Se2- atoms to form CuSe4 tetrahedra that share corners with three FeSe6 octahedra and corners with nine SnSe6 octahedra. The corner-sharing octahedra tilt angles range from 48–64°. There are a spread of Cu–Se bond distances ranging from 2.41–2.51 Å. In the third Cu+1.33+ site, Cu+1.33+ is bonded to four Se2- atoms to form CuSe4 tetrahedra that share corners with three FeSe6 octahedra and corners with nine SnSe6 octahedra. The corner-sharing octahedra tilt angles range from 47–61°. There are a spread of Cu–Se bond distances ranging from 2.40–2.49 Å. There are four inequivalent Sn+3.67+ sites. In the first Sn+3.67+ site, Sn+3.67+ is bonded to six Se2- atoms to form SnSe6 octahedra that share corners with five CuSe4 tetrahedra, edges with two equivalent FeSe6 octahedra, and edges with four SnSe6 octahedra. There are a spread of Sn–Se bond distances ranging from 2.72–2.78 Å. In the second Sn+3.67+ site, Sn+3.67+ is bonded to six Se2- atoms to form SnSe6 octahedra that share corners with four CuSe4 tetrahedra, edges with two equivalent FeSe6 octahedra, and edges with four SnSe6 octahedra. There are a spread of Sn–Se bond distances ranging from 2.72–2.76 Å. In the third Sn+3.67+ site, Sn+3.67+ is bonded to six Se2- atoms to form SnSe6 octahedra that share corners with four CuSe4 tetrahedra, edges with two FeSe6 octahedra, and edges with four SnSe6 octahedra. There are a spread of Sn–Se bond distances ranging from 2.70–2.78 Å. In the fourth Sn+3.67+ site, Sn+3.67+ is bonded to six Se2- atoms to form SnSe6 octahedra that share corners with five CuSe4 tetrahedra, edges with two FeSe6 octahedra, and edges with four SnSe6 octahedra. There are a spread of Sn–Se bond distances ranging from 2.71–2.75 Å. There are twelve inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 3-coordinate geometry to three Sn+3.67+ atoms. In the second Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Cu+1.33+ and three Sn+3.67+ atoms. In the third Se2- site, Se2- is bonded in a 3-coordinate geometry to one Fe3+ and two equivalent Sn+3.67+ atoms. In the fourth Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Fe3+, one Cu+1.33+, and two equivalent Sn+3.67+ atoms. In the fifth Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Fe3+, one Cu+1.33+, and two Sn+3.67+ atoms. In the sixth Se2- site, Se2- is bonded in a 3-coordinate geometry to one Fe3+ and two Sn+3.67+ atoms. In the seventh Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Cu+1.33+ and three Sn+3.67+ atoms. In the eighth Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Cu+1.33+ and three Sn+3.67+ atoms. In the ninth Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Fe3+, one Cu+1.33+, and two equivalent Sn+3.67+ atoms. In the tenth Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Fe3+, one Cu+1.33+, and two equivalent Sn+3.67+ atoms. In the eleventh Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Fe3+, one Cu+1.33+, and two Sn+3.67+ atoms. In the twelfth Se2- site, Se2- is bonded in a rectangular see-saw-like geometry to one Fe3+, one Cu+1.33+, and two Sn+3.67+ atoms.

36 MATERIALS SCIENCE↗