Materials Data on Gd2W2O9 by Materials Project

Abstract

Gd2W2O9 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are two inequivalent Gd3+ sites. In the first Gd3+ site, Gd3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Gd–O bond distances ranging from 2.22–2.86 Å. In the second Gd3+ site, Gd3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Gd–O bond distances ranging from 2.22–2.87 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded to six O2- atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedra tilt angles range from 26–37°. There are a spread of W–O bond distances ranging from 1.83–2.17 Å. In the second W6+ site, W6+ is bonded to six O2- atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedra tilt angles range from 26–36°. There are a spread of W–O bond distances ranging from 1.83–2.17 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Gd3+ and two equivalent W6+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Gd3+ and two equivalent W6+ atoms. In the third O2- site, O2- is bonded to four Gd3+ atoms to form a mixture of edge and corner-sharing OGd4 tetrahedra. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent W6+ atoms. In the fifth O2- site, O2- is bonded to four Gd3+ atoms to form a mixture of edge and corner-sharing OGd4 tetrahedra. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent W6+ atoms. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Gd3+ and one W6+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Gd3+ and one W6+ atom. In the ninth O2- site, O2- is bonded in a bent 150 degrees geometry to two W6+ atoms.