Materials Data on Pm2(WO4)3 by Materials Project

Abstract

Pm2(WO4)3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Pm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pm–O bond distances ranging from 2.39–2.51 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of W–O bond distances ranging from 1.78–2.16 Å. In the second W6+ site, W6+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.80 Å) and two longer (1.85 Å) W–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Pm3+ and two equivalent W6+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pm3+ and one W6+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pm3+ and one W6+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Pm3+ and one W6+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pm3+ and one W6+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Pm3+ and one W6+ atom.