Materials Data on Sm3GeO8 by Materials Project

Sm3GeO8 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Sm–O bond distances ranging from 2.40–2.51 Å. In the second Sm site, Sm is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Sm–O bond distances ranging from 2.33–2.45 Å. Ge is bonded in a distorted trigonal bipyramidal geometry to five O atoms. There are a spread of Ge–O bond distances ranging from 1.82–1.89 Å. There are five inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to one Sm and one Ge atom. In the second O site, O is bonded in a trigonal non-coplanar geometry to three Sm atoms. In the third O site, O is bonded to three Sm and one Ge atom to form a mixture of edge and corner-sharing OSm3Ge tetrahedra. In the fourth O site, O is bonded to three Sm and one Ge atom to form a mixture of distorted edge and corner-sharing OSm3Ge tetrahedra. In the fifth O site, O is bonded in a trigonal non-coplanar geometry to three Sm atoms.