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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

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.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd3GeO8 by Materials Project

Gd3GeO8 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Gd sites. In the first Gd site, Gd is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Gd–O bond distances ranging from 2.34–2.58 Å. In the second Gd site, Gd is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Gd–O bond distances ranging from 2.27–2.43 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 1.81–1.89 Å. There are five inequivalent O sites. In the first O site, O is bonded in a distorted linear geometry to one Gd and one Ge atom. In the second O site, O is bonded in a trigonal non-coplanar geometry to three Gd atoms. In the third O site, O is bonded to three Gd and one Ge atom to form a mixture of edge and corner-sharing OGd3Ge tetrahedra. In the fourth O site, O is bonded to three Gd and one Ge atom to form a mixture of edge and corner-sharing OGd3Ge tetrahedra. In the fifth O site, O is bonded in a trigonal non-coplanar geometry to three Gd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd4Ge3O13 by Materials Project

Gd4Ge3O13 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Gd sites. In the first Gd site, Gd is bonded in a 1-coordinate geometry to three O atoms. There are a spread of Gd–O bond distances ranging from 1.96–2.37 Å. In the second Gd site, Gd is bonded in a 5-coordinate geometry to five O atoms. There are a spread of Gd–O bond distances ranging from 1.91–2.42 Å. In the third Gd site, Gd is bonded in a 3-coordinate geometry to four O atoms. There are a spread of Gd–O bond distances ranging from 2.17–2.81 Å. In the fourth Gd site, Gd is bonded in a 2-coordinate geometry to one Ge and five O atoms. The Gd–Ge bond length is 2.00 Å. There are a spread of Gd–O bond distances ranging from 1.83–2.45 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 1-coordinate geometry to three O atoms. There are a spread of Ge–O bond distances ranging from 1.34–2.00 Å. In the second Ge site, Ge is bonded in a distorted single-bond geometry to four O atoms. There are a spread of Ge–O bond distances ranging from 1.12–2.31 Å. In the third Ge site, Ge is bonded in a 3-coordinate geometry to one Gd and three O atoms. There are a spread of Ge–O bond distances ranging from 1.66–1.87 Å. There are thirteen inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to one Gd and one Ge atom. In the second O site, O is bonded in a water-like geometry to one Gd and one Ge atom. In the third O site, O is bonded in a distorted L-shaped geometry to one Gd and one Ge atom. In the fourth O site, O is bonded in a linear geometry to two Gd atoms. In the fifth O site, O is bonded in a single-bond geometry to one Gd atom. In the sixth O site, O is bonded in a distorted bent 120 degrees geometry to two equivalent Gd atoms. In the seventh O site, O is bonded in a 3-coordinate geometry to one Gd and two Ge atoms. In the eighth O site, O is bonded in a 1-coordinate geometry to two equivalent Gd and one Ge atom. In the ninth O site, O is bonded in a 2-coordinate geometry to one Gd and one Ge atom. In the tenth O site, O is bonded in a single-bond geometry to one Gd and one Ge atom. In the eleventh O site, O is bonded in a distorted single-bond geometry to two Gd and one Ge atom. In the twelfth O site, O is bonded in a single-bond geometry to one Gd atom. In the thirteenth O site, O is bonded in a 3-coordinate geometry to one Gd and one Ge atom.

36 MATERIALS SCIENCE↗