Materials Data on Tm2GeO5 by Materials Project

Abstract

Tm2GeO5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Tm–O bond distances ranging from 2.21–2.53 Å. In the second Tm3+ site, Tm3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Tm–O bond distances ranging from 2.24–2.40 Å. Ge4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Ge–O bond distances ranging from 1.73–1.82 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Tm3+ and one Ge4+ atom. In the second O2- site, O2- is bonded to four Tm3+ atoms to form OTm4 tetrahedra that share corners with five OTm4 tetrahedra and edges with three OTm3Ge tetrahedra. In the third O2- site, O2- is bonded to three Tm3+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OTm3Ge tetrahedra. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tm3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tm3+ and one Ge4+ atom.