DOI: 10.17188/1297599
title: Materials Data on Co3(P2O7)2 by Materials Project

description: Co3(P2O7)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Co+2.67+ sites. In the first Co+2.67+ site, Co+2.67+ is bonded to six O2- atoms to form distorted CoO6 octahedra that share corners with two equivalent PO4 tetrahedra, corners with two equivalent CoO5 trigonal bipyramids, and edges with two equivalent PO4 tetrahedra. There are a spread of Co–O bond distances ranging from 1.90–2.40 Å. In the second Co+2.67+ site, Co+2.67+ is bonded to five O2- atoms to form distorted CoO5 trigonal bipyramids that share corners with two CoO6 octahedra and corners with five PO4 tetrahedra. The corner-sharing octahedral tilt angles are 68°. There are a spread of Co–O bond distances ranging from 1.85–2.32 Å. In the third Co+2.67+ site, Co+2.67+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six PO4 tetrahedra, a cornercorner with one CoO5 trigonal bipyramid, and edges with two CoO6 octahedra. There are a spread of Co–O bond distances ranging from 2.00–2.34 Å. In the fourth Co+2.67+ site, Co+2.67+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with six PO4 tetrahedra and edges with two equivalent CoO6 octahedra. There are a spread of Co–O bond distances ranging from 1.89–2.14 Å. There are four inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four CoO6 octahedra and a cornercorner with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 35–60°. There are a spread of P–O bond distances ranging from 1.50–1.61 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO6 octahedra, a cornercorner with one PO4 tetrahedra, and corners with two equivalent CoO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 55–68°. There is three shorter (1.53 Å) and one longer (1.61 Å) P–O bond length. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO6 octahedra, a cornercorner with one PO4 tetrahedra, a cornercorner with one CoO5 trigonal bipyramid, and an edgeedge with one CoO6 octahedra. The corner-sharing octahedra tilt angles range from 38–56°. There are a spread of P–O bond distances ranging from 1.53–1.61 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two CoO6 octahedra, a cornercorner with one PO4 tetrahedra, and corners with two equivalent CoO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 54–56°. There are a spread of P–O bond distances ranging from 1.52–1.59 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Co+2.67+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Co+2.67+ and one P5+ atom. In the third O2- site, O2- is bonded in a water-like geometry to one Co+2.67+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two P5+ atoms. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one Co+2.67+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one Co+2.67+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Co+2.67+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Co+2.67+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Co+2.67+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Co+2.67+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Co+2.67+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Co+2.67+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a 1-coordinate geometry to two Co+2.67+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two P5+ atoms.