Materials Data on CaFe2(PO4)3 by Materials Project
CaFe2(PO4)3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.70 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with six PO4 tetrahedra and an edgeedge with one FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.94–2.16 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with six PO4 tetrahedra and an edgeedge with one FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.93–2.25 Å. There are three inequivalent P sites. In the first P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with three FeO6 octahedra. The corner-sharing octahedra tilt angles range from 24–50°. There are a spread of P–O bond distances ranging from 1.52–1.56 Å. In the second P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with five FeO6 octahedra. The corner-sharing octahedra tilt angles range from 32–55°. There are a spread of P–O bond distances ranging from 1.53–1.58 Å. In the third P site, P is bonded to four O atoms to form PO4 tetrahedra that share corners with four FeO6 octahedra. The corner-sharing octahedra tilt angles range from 20–59°. There are a spread of P–O bond distances ranging from 1.53–1.60 Å. There are twelve inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to one Fe and one P atom. In the second O site, O is bonded in a bent 150 degrees geometry to one Fe and one P atom. In the third O site, O is bonded in a distorted trigonal planar geometry to two Fe and one P atom. In the fourth O site, O is bonded in a bent 150 degrees geometry to one Fe and one P atom. In the fifth O site, O is bonded in a bent 150 degrees geometry to one Ca and one P atom. In the sixth O site, O is bonded in a 2-coordinate geometry to one Ca, one Fe, and one P atom. In the seventh O site, O is bonded in a 4-coordinate geometry to one Ca, two Fe, and one P atom. In the eighth O site, O is bonded in a bent 150 degrees geometry to one Fe and one P atom. In the ninth O site, O is bonded in a 3-coordinate geometry to one Ca, one Fe, and one P atom. In the tenth O site, O is bonded in a 3-coordinate geometry to one Ca, one Fe, and one P atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to one Ca, one Fe, and one P atom. In the twelfth O site, O is bonded in a distorted trigonal planar geometry to two equivalent Ca and one P atom.