AlPO4 is quartz (alpha)-derived structured and crystallizes in the triclinic P-1 space group. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(3), one O(7), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the second Al site, Al(2) is bonded to one O(11), one O(14), one O(4), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the third Al site, Al(3) is bonded to one O(10), one O(13), one O(16), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. In the fourth Al site, Al(4) is bonded to one O(12), one O(15), one O(2), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(10), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra, and  a cornercorner with one Al(4)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. In the third P site, P(3) is bonded to one O(12), one O(13), one O(14), and one O(15) atom to form PO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra, and corners with two equivalent Al(4)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(11), one O(16), one O(3), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and corners with two equivalent Al(3)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Al(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Al(4) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Al(4) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Al(3) and one P(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(3) and one P(1) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Al(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(4) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Al(3) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Al(2) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one Al(4) and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Al(3) and one P(4) atom.
AlPO4 is quartz (alpha)-derived structured and crystallizes in the triclinic P-1 space group. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(3), one O(7), and one O(8) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The Al(1)-O(1) bond length is 1.75 Å. The Al(1)-O(3) bond length is 1.74 Å. The Al(1)-O(7) bond length is 1.75 Å. The Al(1)-O(8) bond length is 1.76 Å. In the second Al site, Al(2) is bonded to one O(11), one O(14), one O(4), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The Al(2)-O(11) bond length is 1.74 Å. The Al(2)-O(14) bond length is 1.75 Å. The Al(2)-O(4) bond length is 1.75 Å. The Al(2)-O(6) bond length is 1.77 Å. In the third Al site, Al(3) is bonded to one O(10), one O(13), one O(16), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The Al(3)-O(10) bond length is 1.76 Å. The Al(3)-O(13) bond length is 1.76 Å. The Al(3)-O(16) bond length is 1.76 Å. The Al(3)-O(9) bond length is 1.76 Å. In the fourth Al site, Al(4) is bonded to one O(12), one O(15), one O(2), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Al(4)-O(12) bond length is 1.75 Å. The Al(4)-O(15) bond length is 1.77 Å. The Al(4)-O(2) bond length is 1.75 Å. The Al(4)-O(5) bond length is 1.75 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(10), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra, and  a cornercorner with one Al(4)O4 tetrahedra. The P(1)-O(10) bond length is 1.54 Å. The P(1)-O(5) bond length is 1.54 Å. The P(1)-O(6) bond length is 1.55 Å. The P(1)-O(8) bond length is 1.54 Å. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(4)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. The P(2)-O(1) bond length is 1.54 Å. The P(2)-O(2) bond length is 1.54 Å. The P(2)-O(4) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.54 Å. In the third P site, P(3) is bonded to one O(12), one O(13), one O(14), and one O(15) atom to form PO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra, and corners with two equivalent Al(4)O4 tetrahedra. The P(3)-O(12) bond length is 1.54 Å. The P(3)-O(13) bond length is 1.54 Å. The P(3)-O(14) bond length is 1.54 Å. The P(3)-O(15) bond length is 1.55 Å. In the fourth P site, P(4) is bonded to one O(11), one O(16), one O(3), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and corners with two equivalent Al(3)O4 tetrahedra. The P(4)-O(11) bond length is 1.53 Å. The P(4)-O(16) bond length is 1.54 Å. The P(4)-O(3) bond length is 1.53 Å. The P(4)-O(9) bond length is 1.54 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Al(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Al(4) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Al(4) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Al(3) and one P(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(3) and one P(1) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Al(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(4) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Al(3) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Al(2) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one Al(4) and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Al(3) and one P(4) atom.