Ce(AlGe)2 crystallizes in the trigonal P-3m1 space group. Ce(1) is bonded to six equivalent Ge(1) atoms to form distorted CeGe6 octahedra that share corners with twelve equivalent Al(1)Ge4 tetrahedra, edges with six equivalent Ce(1)Ge6 octahedra, and edges with six equivalent Al(1)Ge4 tetrahedra. Al(1) is bonded to four equivalent Ge(1) atoms to form distorted AlGe4 tetrahedra that share corners with six equivalent Ce(1)Ge6 octahedra, corners with six equivalent Al(1)Ge4 tetrahedra, edges with three equivalent Ce(1)Ge6 octahedra, and edges with three equivalent Al(1)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 22-54°. Ge(1) is bonded to three equivalent Ce(1) and four equivalent Al(1) atoms to form a mixture of distorted corner and edge-sharing GeCe3Al4 pentagonal bipyramids.
Ce(AlGe)2 crystallizes in the trigonal P-3m1 space group. Ce(1) is bonded to six equivalent Ge(1) atoms to form distorted CeGe6 octahedra that share corners with twelve equivalent Al(1)Ge4 tetrahedra, edges with six equivalent Ce(1)Ge6 octahedra, and edges with six equivalent Al(1)Ge4 tetrahedra. All Ce(1)-Ge(1) bond lengths are 3.07 Å. Al(1) is bonded to four equivalent Ge(1) atoms to form distorted AlGe4 tetrahedra that share corners with six equivalent Ce(1)Ge6 octahedra, corners with six equivalent Al(1)Ge4 tetrahedra, edges with three equivalent Ce(1)Ge6 octahedra, and edges with three equivalent Al(1)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 22-54°. There are three shorter (2.56 Å) and one longer (2.60 Å) Al(1)-Ge(1) bond length. Ge(1) is bonded to three equivalent Ce(1) and four equivalent Al(1) atoms to form a mixture of distorted corner and edge-sharing GeCe3Al4 pentagonal bipyramids.