Al(PO3)3 crystallizes in the monoclinic P2_1/c space group. Al(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 31-41°. In the second P site, P(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-46°. In the third P site, P(3) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-41°. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the sixth O site, O(9) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the eighth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the ninth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Al(1) and one P(2) atom.
Al(PO3)3 crystallizes in the monoclinic P2_1/c space group. Al(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form AlO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Al(1)-O(1) bond length is 1.87 Å. The Al(1)-O(2) bond length is 1.87 Å. The Al(1)-O(3) bond length is 1.85 Å. The Al(1)-O(4) bond length is 1.88 Å. The Al(1)-O(5) bond length is 1.88 Å. The Al(1)-O(6) bond length is 1.90 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 31-41°. The P(1)-O(3) bond length is 1.47 Å. The P(1)-O(5) bond length is 1.48 Å. The P(1)-O(7) bond length is 1.58 Å. The P(1)-O(9) bond length is 1.59 Å. In the second P site, P(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-46°. The P(2)-O(4) bond length is 1.48 Å. The P(2)-O(6) bond length is 1.48 Å. The P(2)-O(7) bond length is 1.58 Å. The P(2)-O(8) bond length is 1.59 Å. In the third P site, P(3) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-41°. The P(3)-O(1) bond length is 1.48 Å. The P(3)-O(2) bond length is 1.48 Å. The P(3)-O(8) bond length is 1.59 Å. The P(3)-O(9) bond length is 1.59 Å. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the sixth O site, O(9) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the eighth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the ninth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Al(1) and one P(2) atom.