AlPO4 is Keatite-derived structured and crystallizes in the cubic F-43m space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent O(2) atoms to form AlO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(3) and three equivalent O(1) atoms to form AlO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2) and three equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with three equivalent Al(2)O4 tetrahedra. In the second P site, P(2) is bonded to four equivalent O(3) atoms to form PO4 tetrahedra that share corners with four equivalent Al(2)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Al(1) and one P(1) atom. In the third O site, O(3) is bonded in a linear geometry to one Al(2) and one P(2) atom.
AlPO4 is Keatite-derived structured and crystallizes in the cubic F-43m space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent O(2) atoms to form AlO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. All Al(1)-O(2) bond lengths are 1.71 Å. In the second Al site, Al(2) is bonded to one O(3) and three equivalent O(1) atoms to form AlO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Al(2)-O(3) bond length is 1.72 Å. All Al(2)-O(1) bond lengths are 1.74 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2) and three equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with three equivalent Al(2)O4 tetrahedra. The P(1)-O(2) bond length is 1.50 Å. All P(1)-O(1) bond lengths are 1.52 Å. In the second P site, P(2) is bonded to four equivalent O(3) atoms to form PO4 tetrahedra that share corners with four equivalent Al(2)O4 tetrahedra. All P(2)-O(3) bond lengths are 1.52 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Al(1) and one P(1) atom. In the third O site, O(3) is bonded in a linear geometry to one Al(2) and one P(2) atom.