DOI: 10.17188/1283631
title: Materials Data on AlPO4 by Materials Project

description: AlPO4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to five O2- atoms to form distorted AlO5 trigonal bipyramids that share corners with two PO4 tetrahedra, a cornercorner with one AlO5 trigonal bipyramid, and edges with two AlO5 trigonal bipyramids. There are a spread of Al–O bond distances ranging from 1.79–1.94 Å. In the second Al3+ site, Al3+ is bonded to five O2- atoms to form distorted AlO5 trigonal bipyramids that share corners with two equivalent AlO4 tetrahedra, an edgeedge with one PO4 tetrahedra, and an edgeedge with one AlO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.84–1.93 Å. In the third Al3+ site, Al3+ is bonded to four O2- atoms to form distorted AlO4 tetrahedra that share a cornercorner with one PO4 tetrahedra and corners with two equivalent AlO5 trigonal bipyramids. There are a spread of Al–O bond distances ranging from 1.73–1.84 Å. In the fourth Al3+ site, Al3+ is bonded to five O2- atoms to form distorted AlO5 trigonal bipyramids that share a cornercorner with one PO4 tetrahedra, a cornercorner with one AlO5 trigonal bipyramid, an edgeedge with one PO4 tetrahedra, and an edgeedge with one AlO5 trigonal bipyramid. There are a spread of Al–O bond distances ranging from 1.82–2.00 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 a cornercorner with one AlO5 trigonal bipyramid and an edgeedge with one AlO5 trigonal bipyramid. There are a spread of P–O bond distances ranging from 1.49–1.66 Å. In the second P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is one shorter (1.53 Å) and two longer (1.54 Å) P–O bond length. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra, corners with two AlO5 trigonal bipyramids, and an edgeedge with one AlO5 trigonal bipyramid. There are a spread of P–O bond distances ranging from 1.52–1.57 Å. In the fourth P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.52–1.61 Å. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to three Al3+ atoms. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to one Al3+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted T-shaped geometry to two Al3+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one P5+ and one O2- atom. The O–O bond length is 1.48 Å. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Al3+ and one O2- atom. In the seventh O2- site, O2- is bonded in a water-like geometry to one Al3+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Al3+ atoms. In the ninth O2- site, O2- is bonded in a bent 150 degrees geometry to one Al3+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Al3+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in an L-shaped geometry to one Al3+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a bent 120 degrees geometry to one Al3+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in an L-shaped geometry to one Al3+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a bent 120 degrees geometry to one Al3+ and one P5+ atom. In the fifteenth O2- site, O2- is bonded in an L-shaped geometry to one Al3+ and one P5+ atom. In the sixteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Al3+ and one P5+ atom.