Materials Data on Ho2WO6 by Materials Project

Abstract

Ho2WO6 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. there are two inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ho–O bond distances ranging from 2.23–2.58 Å. In the second Ho3+ site, Ho3+ is bonded to seven O2- atoms to form distorted HoO7 hexagonal pyramids that share corners with three equivalent WO6 octahedra, edges with two equivalent HoO7 hexagonal pyramids, and edges with two equivalent WO6 octahedra. The corner-sharing octahedra tilt angles range from 39–46°. There are a spread of Ho–O bond distances ranging from 2.29–2.40 Å. W6+ is bonded to six O2- atoms to form WO6 octahedra that share corners with three equivalent HoO7 hexagonal pyramids and edges with two equivalent HoO7 hexagonal pyramids. There are a spread of W–O bond distances ranging from 1.89–2.03 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Ho3+ and one W6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ho3+ and one W6+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ho3+ and one W6+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Ho3+ and one W6+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Ho3+ and one W6+ atom. In the sixth O2- site, O2- is bonded to three Ho3+ and one W6+ atom to form distorted corner-sharing OHo3W tetrahedra.