Ba3Cd(GeO4)2 crystallizes in the trigonal P-3m1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one O(1) and nine equivalent O(2) atoms. In the second Ba site, Ba(2) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share edges with six equivalent Ba(2)O12 cuboctahedra, edges with six equivalent Ge(1)O4 tetrahedra, and faces with two equivalent Cd(1)O6 octahedra. Cd(1) is bonded to six equivalent O(2) atoms to form CdO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and faces with two equivalent Ba(2)O12 cuboctahedra. Ge(1) is bonded to one O(1) and three equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Cd(1)O6 octahedra and edges with three equivalent Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 16°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ba(1), three equivalent Ba(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Ba(2), three equivalent Ba(1), one Cd(1), and one Ge(1) atom.
Ba3Cd(GeO4)2 crystallizes in the trigonal P-3m1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one O(1) and nine equivalent O(2) atoms. The Ba(1)-O(1) bond length is 2.48 Å. There are six shorter (2.95 Å) and three longer (3.10 Å) Ba(1)-O(2) bond lengths. In the second Ba site, Ba(2) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form distorted BaO12 cuboctahedra that share edges with six equivalent Ba(2)O12 cuboctahedra, edges with six equivalent Ge(1)O4 tetrahedra, and faces with two equivalent Cd(1)O6 octahedra. All Ba(2)-O(1) bond lengths are 3.39 Å. All Ba(2)-O(2) bond lengths are 2.91 Å. Cd(1) is bonded to six equivalent O(2) atoms to form CdO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and faces with two equivalent Ba(2)O12 cuboctahedra. All Cd(1)-O(2) bond lengths are 2.28 Å. Ge(1) is bonded to one O(1) and three equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Cd(1)O6 octahedra and edges with three equivalent Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 16°. The Ge(1)-O(1) bond length is 1.72 Å. All Ge(1)-O(2) bond lengths are 1.77 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ba(1), three equivalent Ba(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Ba(2), three equivalent Ba(1), one Cd(1), and one Ge(1) atom.