Materials Data on Tl2GeTe3 by Materials Project

Abstract

Tl2GeTe3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Tl1+ sites. In the first Tl1+ site, Tl1+ is bonded in a 4-coordinate geometry to one Tl1+ and seven Te2- atoms. The Tl–Tl bond length is 3.62 Å. There are a spread of Tl–Te bond distances ranging from 3.27–4.29 Å. In the second Tl1+ site, Tl1+ is bonded in a 10-coordinate geometry to two Tl1+ and eight Te2- atoms. The Tl–Tl bond length is 3.60 Å. There are a spread of Tl–Te bond distances ranging from 3.43–3.84 Å. Ge4+ is bonded to four Te2- atoms to form edge-sharing GeTe4 tetrahedra. There are a spread of Ge–Te bond distances ranging from 2.63–2.70 Å. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a 7-coordinate geometry to five Tl1+, one Ge4+, and one Te2- atom. The Te–Te bond length is 3.49 Å. In the second Te2- site, Te2- is bonded in a 2-coordinate geometry to four equivalent Tl1+, two equivalent Ge4+, and two equivalent Te2- atoms. In the third Te2- site, Te2- is bonded in a 6-coordinate geometry to four equivalent Tl1+ and two equivalent Ge4+ atoms. In the fourth Te2- site, Te2- is bonded in a 6-coordinate geometry to six Tl1+ and one Ge4+ atom.