Y(PO3)3 crystallizes in the monoclinic Cc space group. Y(1) is bonded to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form YO6 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(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Y(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 36-39°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Y(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 are 29°. In the third P site, P(3) is bonded to one O(2), one O(3), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Y(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 25-33°. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one Y(1) and one P(3) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to one P(2) and one P(3) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Y(1) and one P(1) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one Y(1) and one P(1) atom. In the seventh O site, O(6) is bonded in a bent 150 degrees geometry to one Y(1) and one P(2) atom. In the eighth O site, O(7) is bonded in a bent 150 degrees geometry to one Y(1) and one P(2) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one Y(1) and one P(3) atom.
Y(PO3)3 crystallizes in the monoclinic Cc space group. Y(1) is bonded to one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form YO6 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 Y(1)-O(4) bond length is 2.23 Å. The Y(1)-O(5) bond length is 2.24 Å. The Y(1)-O(6) bond length is 2.26 Å. The Y(1)-O(7) bond length is 2.24 Å. The Y(1)-O(8) bond length is 2.24 Å. The Y(1)-O(9) bond length is 2.23 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Y(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 36-39°. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(3) bond length is 1.58 Å. The P(1)-O(4) bond length is 1.48 Å. The P(1)-O(5) bond length is 1.49 Å. In the second P site, P(2) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Y(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 are 29°. The P(2)-O(1) bond length is 1.59 Å. The P(2)-O(2) bond length is 1.59 Å. The P(2)-O(6) bond length is 1.49 Å. The P(2)-O(7) bond length is 1.48 Å. In the third P site, P(3) is bonded to one O(2), one O(3), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Y(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 25-33°. The P(3)-O(2) bond length is 1.59 Å. The P(3)-O(3) bond length is 1.58 Å. The P(3)-O(8) bond length is 1.48 Å. The P(3)-O(9) bond length is 1.48 Å. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one Y(1) and one P(3) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to one P(2) and one P(3) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Y(1) and one P(1) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one Y(1) and one P(1) atom. In the seventh O site, O(6) is bonded in a bent 150 degrees geometry to one Y(1) and one P(2) atom. In the eighth O site, O(7) is bonded in a bent 150 degrees geometry to one Y(1) and one P(2) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one Y(1) and one P(3) atom.