Materials Data on Gd2GeO5 by Materials Project
Gd2GeO5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Gd3+ sites. In the first Gd3+ site, Gd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Gd–O bond distances ranging from 2.31–2.83 Å. In the second Gd3+ site, Gd3+ is bonded to seven O2- atoms to form distorted GdO7 hexagonal pyramids that share corners with two equivalent GeO4 tetrahedra, edges with six equivalent GdO7 hexagonal pyramids, and an edgeedge with one GeO4 tetrahedra. There are a spread of Gd–O bond distances ranging from 2.28–2.58 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent GdO7 hexagonal pyramids and an edgeedge with one GdO7 hexagonal pyramid. 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 Gd3+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Gd3+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Gd3+ and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Gd3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded to four Gd3+ atoms to form a mixture of corner and edge-sharing OGd4 tetrahedra.