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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CuNi2(PO4)2 by Materials Project

CuNi2(PO4)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ni2+ is bonded to five O2- atoms to form NiO5 trigonal bipyramids that share corners with five equivalent PO4 tetrahedra and an edgeedge with one NiO5 trigonal bipyramid. There are a spread of Ni–O bond distances ranging from 2.03–2.08 Å. Cu2+ is bonded in a distorted square co-planar geometry to four O2- atoms. There are two shorter (1.96 Å) and two longer (2.04 Å) Cu–O bond lengths. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with five equivalent NiO5 trigonal bipyramids. There are a spread of P–O bond distances ranging from 1.53–1.57 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to one Ni2+, one Cu2+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ni2+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ni2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ni2+, one Cu2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu3NiP2O9 by Materials Project

NiCu3P2O9 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Ni–O bond distances ranging from 2.04–2.25 Å. There are three inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cu–O bond distances ranging from 1.93–2.27 Å. In the second Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.92–2.11 Å. In the third Cu2+ site, Cu2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.91–2.42 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent NiO6 octahedra. The corner-sharing octahedra tilt angles range from 33–57°. There are a spread of P–O bond distances ranging from 1.53–1.58 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent NiO6 octahedra. The corner-sharing octahedra tilt angles range from 40–44°. There are a spread of P–O bond distances ranging from 1.55–1.59 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Ni2+, one Cu2+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ni2+, one Cu2+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ni2+, one Cu2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Ni2+, two Cu2+, and one P5+ atom. In the fifth O2- site, O2- is bonded to four Cu2+ atoms to form edge-sharing OCu4 tetrahedra. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Cu2+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to one Ni2+, one Cu2+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to two Cu2+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to one Ni2+, one Cu2+, and one P5+ atom.

36 MATERIALS SCIENCE↗