Materials Data on Dy2W2O9 by Materials Project

Abstract

Dy2W2O9 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Dy3+ sites. In the first Dy3+ site, Dy3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Dy–O bond distances ranging from 2.30–2.61 Å. In the second Dy3+ site, Dy3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Dy–O bond distances ranging from 2.35–2.61 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded to six O2- atoms to form distorted corner-sharing WO6 octahedra. There are a spread of W–O bond distances ranging from 1.83–2.18 Å. In the second W6+ site, W6+ is bonded to five O2- atoms to form corner-sharing WO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 44–54°. There are a spread of W–O bond distances ranging from 1.84–1.94 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Dy3+ and one W6+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Dy3+ and two W6+ atoms. In the third O2- site, O2- is bonded to three Dy3+ and one W6+ atom to form a mixture of distorted edge and corner-sharing ODy3W trigonal pyramids. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Dy3+ and one W6+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Dy3+ and two W6+ atoms. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to one Dy3+ and one W6+ atom. In the seventh O2- site, O2- is bonded to three Dy3+ and one W6+ atom to form a mixture of distorted edge and corner-sharing ODy3W tetrahedra. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Dy3+ and one W6+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two Dy3+ and one W6+ atom.