Materials Data on AlPO4 by Materials Project

AlPO4 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with six equivalent PO4 tetrahedra and edges with two equivalent AlO6 octahedra. There is two shorter (1.82 Å) and four longer (2.01 Å) Al–O bond length. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with six equivalent AlO6 octahedra. The corner-sharing octahedra tilt angles range from 48–54°. There is two shorter (1.52 Å) and two longer (1.59 Å) P–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Al3+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Al3+ and one P5+ atom.