CoGeO3 crystallizes in the triclinic P1 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. In the second Co site, Co(2) is bonded to one O(11), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form CoO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. In the third Co site, Co(3) is bonded to one O(10), one O(11), one O(3), one O(4), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Ge(2)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. In the fourth Co site, Co(4) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(8) atom to form CoO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. In the second Ge site, Ge(2) is bonded to one O(1), one O(5), one O(7), and one O(9) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the third Ge site, Ge(3) is bonded to one O(11), one O(2), one O(6), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. In the fourth Ge site, Ge(4) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Co(4), one Ge(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Co(4), one Ge(3), and one Ge(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Co(3), one Co(4), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Co(1), one Co(2), one Co(3), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the fifth O site, O(5) is bonded to one Co(1), one Co(3), one Co(4), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Co(2), one Ge(3), and one Ge(4) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Co(2), one Ge(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Co(3), one Co(4), and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one Ge(2) atom. In the tenth O site, O(10) is bonded to one Co(1), one Co(3), one Co(4), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the eleventh O site, O(11) is bonded to one Co(1), one Co(2), one Co(3), and one Ge(3) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one Ge(4) atom.
CoGeO3 crystallizes in the triclinic P1 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra,  an edgeedge with one Co(4)O6 octahedra, edges with two equivalent Co(2)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The Co(1)-O(10) bond length is 2.21 Å. The Co(1)-O(11) bond length is 2.10 Å. The Co(1)-O(12) bond length is 2.03 Å. The Co(1)-O(4) bond length is 2.10 Å. The Co(1)-O(5) bond length is 2.20 Å. The Co(1)-O(9) bond length is 2.05 Å. In the second Co site, Co(2) is bonded to one O(11), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form CoO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra,  an edgeedge with one Co(3)O6 octahedra, and edges with two equivalent Co(1)O6 octahedra. The Co(2)-O(11) bond length is 2.10 Å. The Co(2)-O(12) bond length is 2.01 Å. The Co(2)-O(4) bond length is 2.10 Å. The Co(2)-O(6) bond length is 2.31 Å. The Co(2)-O(7) bond length is 2.31 Å. The Co(2)-O(9) bond length is 2.02 Å. In the third Co site, Co(3) is bonded to one O(10), one O(11), one O(3), one O(4), one O(5), and one O(8) atom to form CoO6 octahedra that share  a cornercorner with one Ge(2)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra,  an edgeedge with one Co(2)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(4)O6 octahedra. The Co(3)-O(10) bond length is 2.07 Å. The Co(3)-O(11) bond length is 2.14 Å. The Co(3)-O(3) bond length is 2.05 Å. The Co(3)-O(4) bond length is 2.18 Å. The Co(3)-O(5) bond length is 2.08 Å. The Co(3)-O(8) bond length is 2.09 Å. In the fourth Co site, Co(4) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(8) atom to form CoO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(3)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and edges with two equivalent Co(3)O6 octahedra. The Co(4)-O(1) bond length is 2.28 Å. The Co(4)-O(10) bond length is 2.13 Å. The Co(4)-O(2) bond length is 2.29 Å. The Co(4)-O(3) bond length is 2.00 Å. The Co(4)-O(5) bond length is 2.13 Å. The Co(4)-O(8) bond length is 1.99 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. The Ge(1)-O(1) bond length is 1.82 Å. The Ge(1)-O(3) bond length is 1.76 Å. The Ge(1)-O(4) bond length is 1.78 Å. The Ge(1)-O(7) bond length is 1.82 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(5), one O(7), and one O(9) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-61°. The Ge(2)-O(1) bond length is 1.82 Å. The Ge(2)-O(5) bond length is 1.78 Å. The Ge(2)-O(7) bond length is 1.82 Å. The Ge(2)-O(9) bond length is 1.75 Å. In the third Ge site, Ge(3) is bonded to one O(11), one O(2), one O(6), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(3)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. The Ge(3)-O(11) bond length is 1.78 Å. The Ge(3)-O(2) bond length is 1.82 Å. The Ge(3)-O(6) bond length is 1.82 Å. The Ge(3)-O(8) bond length is 1.75 Å. In the fourth Ge site, Ge(4) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Co(3)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, corners with two equivalent Co(4)O6 octahedra, and corners with two equivalent Ge(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. The Ge(4)-O(10) bond length is 1.78 Å. The Ge(4)-O(12) bond length is 1.75 Å. The Ge(4)-O(2) bond length is 1.82 Å. The Ge(4)-O(6) bond length is 1.82 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Co(4), one Ge(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Co(4), one Ge(3), and one Ge(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Co(3), one Co(4), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Co(1), one Co(2), one Co(3), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the fifth O site, O(5) is bonded to one Co(1), one Co(3), one Co(4), and one Ge(2) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Co(2), one Ge(3), and one Ge(4) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Co(2), one Ge(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Co(3), one Co(4), and one Ge(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one Ge(2) atom. In the tenth O site, O(10) is bonded to one Co(1), one Co(3), one Co(4), and one Ge(4) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the eleventh O site, O(11) is bonded to one Co(1), one Co(2), one Co(3), and one Ge(3) atom to form a mixture of distorted edge and corner-sharing OCo3Ge trigonal pyramids. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one Ge(4) atom.