Materials Data on Ga3Cu3SiSe8 by Materials Project
Cu3Ga3SiSe8 crystallizes in the tetragonal P-4 space group. The structure is three-dimensional. there are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four Se2- atoms to form CuSe4 tetrahedra that share corners with two equivalent CuSe4 tetrahedra, corners with two equivalent SiSe4 tetrahedra, and corners with six GaSe4 tetrahedra. There are two shorter (2.42 Å) and two longer (2.45 Å) Cu–Se bond lengths. In the second Cu1+ site, Cu1+ is bonded to four equivalent Se2- atoms to form CuSe4 tetrahedra that share corners with four equivalent CuSe4 tetrahedra and corners with eight GaSe4 tetrahedra. All Cu–Se bond lengths are 2.43 Å. There are two inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded to four Se2- atoms to form GaSe4 tetrahedra that share corners with two equivalent GaSe4 tetrahedra, corners with two equivalent SiSe4 tetrahedra, and corners with six CuSe4 tetrahedra. There are two shorter (2.46 Å) and two longer (2.47 Å) Ga–Se bond lengths. In the second Ga3+ site, Ga3+ is bonded to four equivalent Se2- atoms to form GaSe4 tetrahedra that share corners with four equivalent GaSe4 tetrahedra and corners with eight CuSe4 tetrahedra. All Ga–Se bond lengths are 2.45 Å. Si4+ is bonded to four equivalent Se2- atoms to form SiSe4 tetrahedra that share corners with four equivalent CuSe4 tetrahedra and corners with four equivalent GaSe4 tetrahedra. All Si–Se bond lengths are 2.32 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a trigonal non-coplanar geometry to one Cu1+, one Ga3+, and one Si4+ atom. In the second Se2- site, Se2- is bonded to two Cu1+ and two Ga3+ atoms to form corner-sharing SeGa2Cu2 tetrahedra.