Materials Data on Na3GdV2O8 by Materials Project

Abstract

Na3Gd(VO4)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a distorted single-bond geometry to one O2- atom. The Na–O bond length is 2.18 Å. In the second Na1+ site, Na1+ is bonded in a distorted hexagonal planar geometry to six equivalent O2- atoms. All Na–O bond lengths are 2.88 Å. Gd3+ is bonded to six equivalent O2- atoms to form GdO6 octahedra that share corners with six equivalent VO4 tetrahedra. All Gd–O bond lengths are 2.27 Å. V5+ is bonded to four O2- atoms to form VO4 tetrahedra that share corners with three equivalent GdO6 octahedra. The corner-sharing octahedral tilt angles are 17°. There is one shorter (1.68 Å) and three longer (1.76 Å) V–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to one Na1+ and one V5+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to one Na1+, one Gd3+, and one V5+ atom.