CaCd2P2 crystallizes in the trigonal P-3m1 space group. Ca(1) is bonded to six equivalent P(1) atoms to form CaP6 octahedra that share corners with twelve equivalent Cd(1)P4 tetrahedra, edges with six equivalent Ca(1)P6 octahedra, and edges with six equivalent Cd(1)P4 tetrahedra. Cd(1) is bonded to four equivalent P(1) atoms to form distorted CdP4 tetrahedra that share corners with six equivalent Ca(1)P6 octahedra, corners with six equivalent Cd(1)P4 tetrahedra, edges with three equivalent Ca(1)P6 octahedra, and edges with three equivalent Cd(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-56°. P(1) is bonded to three equivalent Ca(1) and four equivalent Cd(1) atoms to form a mixture of distorted edge and corner-sharing PCa3Cd4 pentagonal bipyramids.
CaCd2P2 crystallizes in the trigonal P-3m1 space group. Ca(1) is bonded to six equivalent P(1) atoms to form CaP6 octahedra that share corners with twelve equivalent Cd(1)P4 tetrahedra, edges with six equivalent Ca(1)P6 octahedra, and edges with six equivalent Cd(1)P4 tetrahedra. All Ca(1)-P(1) bond lengths are 3.00 Å. Cd(1) is bonded to four equivalent P(1) atoms to form distorted CdP4 tetrahedra that share corners with six equivalent Ca(1)P6 octahedra, corners with six equivalent Cd(1)P4 tetrahedra, edges with three equivalent Ca(1)P6 octahedra, and edges with three equivalent Cd(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-56°. There are three shorter (2.62 Å) and one longer (2.81 Å) Cd(1)-P(1) bond length. P(1) is bonded to three equivalent Ca(1) and four equivalent Cd(1) atoms to form a mixture of distorted edge and corner-sharing PCa3Cd4 pentagonal bipyramids.