Fe2(PO3)5 crystallizes in the monoclinic Pc space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(11), one O(12), one O(3), one O(6), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(12), one O(14), one O(6), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 octahedra. There are five inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. In the second P site, P(2) is bonded to one O(12), one O(13), one O(2), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 16-66°. In the third P site, P(3) is bonded to one O(13), one O(15), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-63°. In the fourth P site, P(4) is bonded to one O(1), one O(14), one O(15), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Fe(2)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 21-53°. In the fifth P site, P(5) is bonded to one O(10), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Fe(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 21-44°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one P(2) and one P(5) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(5) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(5) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Fe(2) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(5) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(2), and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one P(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Fe(2) and one P(4) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one P(3) and one P(4) atom.
Fe2(PO3)5 crystallizes in the monoclinic Pc space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(11), one O(12), one O(3), one O(6), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(5)O4 tetrahedra, and  an edgeedge with one Fe(2)O6 octahedra. The Fe(1)-O(10) bond length is 2.01 Å. The Fe(1)-O(11) bond length is 2.01 Å. The Fe(1)-O(12) bond length is 2.06 Å. The Fe(1)-O(3) bond length is 2.01 Å. The Fe(1)-O(6) bond length is 2.23 Å. The Fe(1)-O(9) bond length is 1.99 Å. In the second Fe site, Fe(2) is bonded to one O(1), one O(12), one O(14), one O(6), one O(7), and one O(8) atom to form distorted FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 octahedra. The Fe(2)-O(1) bond length is 1.99 Å. The Fe(2)-O(12) bond length is 2.60 Å. The Fe(2)-O(14) bond length is 2.10 Å. The Fe(2)-O(6) bond length is 2.46 Å. The Fe(2)-O(7) bond length is 2.12 Å. The Fe(2)-O(8) bond length is 2.01 Å. There are five inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. The P(1)-O(11) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.63 Å. The P(1)-O(5) bond length is 1.61 Å. The P(1)-O(7) bond length is 1.49 Å. In the second P site, P(2) is bonded to one O(12), one O(13), one O(2), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 16-66°. The P(2)-O(12) bond length is 1.52 Å. The P(2)-O(13) bond length is 1.58 Å. The P(2)-O(2) bond length is 1.60 Å. The P(2)-O(8) bond length is 1.48 Å. In the third P site, P(3) is bonded to one O(13), one O(15), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-63°. The P(3)-O(13) bond length is 1.58 Å. The P(3)-O(15) bond length is 1.58 Å. The P(3)-O(6) bond length is 1.52 Å. The P(3)-O(9) bond length is 1.50 Å. In the fourth P site, P(4) is bonded to one O(1), one O(14), one O(15), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Fe(2)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 21-53°. The P(4)-O(1) bond length is 1.49 Å. The P(4)-O(14) bond length is 1.49 Å. The P(4)-O(15) bond length is 1.64 Å. The P(4)-O(5) bond length is 1.61 Å. In the fifth P site, P(5) is bonded to one O(10), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with two equivalent Fe(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 21-44°. The P(5)-O(10) bond length is 1.51 Å. The P(5)-O(2) bond length is 1.63 Å. The P(5)-O(3) bond length is 1.50 Å. The P(5)-O(4) bond length is 1.59 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one P(2) and one P(5) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(5) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(5) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Fe(2) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(5) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(2), and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one P(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Fe(2) and one P(4) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one P(3) and one P(4) atom.