Co3(PO4)2 crystallizes in the triclinic P-1 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form distorted CoO6 octahedra that share corners with two equivalent Co(4)O6 octahedra, corners with four equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-64°. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom to form distorted CoO6 octahedra that share corners with two equivalent Co(3)O6 octahedra, corners with four equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. In the third Co site, Co(3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with four equivalent Co(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-61°. In the fourth Co site, Co(4) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with four equivalent Co(1)O6 octahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-64°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with three equivalent Co(2)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-57°. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with three equivalent Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one P(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(3), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Co(2), one Co(3), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Co(1), one Co(4), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(3), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Co(2), one Co(4), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one P(1) atom.
Co3(PO4)2 crystallizes in the triclinic P-1 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form distorted CoO6 octahedra that share corners with two equivalent Co(4)O6 octahedra, corners with four equivalent Co(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-64°. The Co(1)-O(1) bond length is 2.14 Å. The Co(1)-O(2) bond length is 2.35 Å. The Co(1)-O(4) bond length is 2.12 Å. The Co(1)-O(5) bond length is 2.10 Å. The Co(1)-O(7) bond length is 2.04 Å. The Co(1)-O(8) bond length is 2.12 Å. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom to form distorted CoO6 octahedra that share corners with two equivalent Co(3)O6 octahedra, corners with four equivalent Co(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. The Co(2)-O(1) bond length is 2.30 Å. The Co(2)-O(2) bond length is 2.17 Å. The Co(2)-O(3) bond length is 2.10 Å. The Co(2)-O(6) bond length is 2.13 Å. The Co(2)-O(7) bond length is 2.14 Å. The Co(2)-O(8) bond length is 2.05 Å. In the third Co site, Co(3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with four equivalent Co(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-61°. Both Co(3)-O(2) bond lengths are 2.03 Å. Both Co(3)-O(3) bond lengths are 2.16 Å. Both Co(3)-O(5) bond lengths are 2.15 Å. In the fourth Co site, Co(4) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with four equivalent Co(1)O6 octahedra, corners with two equivalent P(2)O4 tetrahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-64°. Both Co(4)-O(1) bond lengths are 2.12 Å. Both Co(4)-O(4) bond lengths are 2.16 Å. Both Co(4)-O(6) bond lengths are 2.12 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra,  a cornercorner with one Co(3)O6 octahedra, corners with three equivalent Co(2)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-57°. The P(1)-O(2) bond length is 1.61 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(5) bond length is 1.54 Å. The P(1)-O(8) bond length is 1.55 Å. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra,  a cornercorner with one Co(4)O6 octahedra, corners with three equivalent Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. The P(2)-O(1) bond length is 1.60 Å. The P(2)-O(4) bond length is 1.55 Å. The P(2)-O(6) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.55 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one P(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(3), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Co(2), one Co(3), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Co(1), one Co(4), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(3), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Co(2), one Co(4), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one P(1) atom.