Materials Data on NaPO4 by Materials Project

Abstract

NaPO4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded to six O atoms to form distorted NaO6 octahedra that share corners with four PO4 tetrahedra and a faceface with one NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.35–2.51 Å. In the second Na site, Na is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.32–2.52 Å. There are two inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four equivalent NaO6 octahedra and corners with two equivalent PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 36–53°. There is two shorter (1.50 Å) and two longer (1.64 Å) P–O bond length. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with two equivalent NaO6 octahedra and corners with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 43–53°. There are a spread of P–O bond distances ranging from 1.49–1.64 Å. There are seven inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to two equivalent P atoms. In the second O site, O is bonded in a 1-coordinate geometry to two equivalent Na and one P atom. In the third O site, O is bonded in a bent 120 degrees geometry to two P atoms. In the fourth O site, O is bonded in a 3-coordinate geometry to two Na and one P atom. In the fifth O site, O is bonded in an L-shaped geometry to two Na atoms. In the sixth O site, O is bonded in a 3-coordinate geometry to two Na and one P atom. In the seventh O site, O is bonded in an L-shaped geometry to two equivalent Na atoms.