Materials Data on CsTa(CuTe2)2 by Materials Project
CsTa(CuTe2)2 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Cs1+ is bonded in a 9-coordinate geometry to nine Te2- atoms. There are a spread of Cs–Te bond distances ranging from 3.86–4.30 Å. Ta5+ is bonded to four Te2- atoms to form TaTe4 tetrahedra that share edges with four CuTe4 tetrahedra. There are a spread of Ta–Te bond distances ranging from 2.63–2.67 Å. There are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with six CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. There are a spread of Cu–Te bond distances ranging from 2.62–2.64 Å. In the second Cu1+ site, Cu1+ is bonded to four Te2- atoms to form CuTe4 tetrahedra that share corners with four equivalent CuTe4 tetrahedra and edges with two equivalent TaTe4 tetrahedra. There are two shorter (2.62 Å) and two longer (2.63 Å) Cu–Te bond lengths. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 5-coordinate geometry to two equivalent Cs1+, one Ta5+, and two Cu1+ atoms. In the second Te2- site, Te2- is bonded in a 3-coordinate geometry to two equivalent Cs1+, one Ta5+, and two Cu1+ atoms. In the third Te2- site, Te2- is bonded in a 5-coordinate geometry to one Cs1+, one Ta5+, and three Cu1+ atoms. In the fourth Te2- site, Te2- is bonded in a 6-coordinate geometry to four equivalent Cs1+, one Ta5+, and one Cu1+ atom.