CdGeO3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CdO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Cd(2)O6 octahedra. In the second Cd site, Cd(2) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CdO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Cd(2)O6 octahedra, and edges with three equivalent Cd(1)O6 octahedra. Ge(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Cd(2)O6 octahedra, corners with four equivalent Cd(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-69°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Cd(1) and two equivalent Ge(1) atoms. In the third O site, O(3) is bonded to one Cd(1), two equivalent Cd(2), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OCd3Ge trigonal pyramids.
CdGeO3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CdO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Cd(2)O6 octahedra. Both Cd(1)-O(1) bond lengths are 2.20 Å. Both Cd(1)-O(2) bond lengths are 2.50 Å. Both Cd(1)-O(3) bond lengths are 2.39 Å. In the second Cd site, Cd(2) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CdO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Cd(2)O6 octahedra, and edges with three equivalent Cd(1)O6 octahedra. Both Cd(2)-O(1) bond lengths are 2.26 Å. There are two shorter (2.28 Å) and two longer (2.34 Å) Cd(2)-O(3) bond lengths. Ge(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Cd(2)O6 octahedra, corners with four equivalent Cd(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-69°. The Ge(1)-O(1) bond length is 1.72 Å. The Ge(1)-O(3) bond length is 1.74 Å. Both Ge(1)-O(2) bond lengths are 1.81 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Cd(1) and two equivalent Ge(1) atoms. In the third O site, O(3) is bonded to one Cd(1), two equivalent Cd(2), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OCd3Ge trigonal pyramids.