Materials Data on K2GeTe4 by Materials Project
K2GeTe4 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 4-coordinate geometry to eight Te+1.50- atoms. There are a spread of K–Te bond distances ranging from 3.61–4.20 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to eight Te+1.50- atoms. There are a spread of K–Te bond distances ranging from 3.65–4.24 Å. Ge4+ is bonded in a tetrahedral geometry to four Te+1.50- atoms. There are a spread of Ge–Te bond distances ranging from 2.55–2.69 Å. There are four inequivalent Te+1.50- sites. In the first Te+1.50- site, Te+1.50- is bonded in a 2-coordinate geometry to three equivalent K1+, one Ge4+, and one Te+1.50- atom. The Te–Te bond length is 2.77 Å. In the second Te+1.50- site, Te+1.50- is bonded in a 5-coordinate geometry to five K1+ and one Ge4+ atom. In the third Te+1.50- site, Te+1.50- is bonded in a 6-coordinate geometry to five K1+ and one Ge4+ atom. In the fourth Te+1.50- site, Te+1.50- is bonded in a 1-coordinate geometry to three K1+, one Ge4+, and one Te+1.50- atom.