Ce(CdAs)3 crystallizes in the monoclinic Pm space group. Ce(1) is bonded to three equivalent As(1) and three equivalent As(2) atoms to form CeAs6 octahedra that share corners with three equivalent Cd(1)As4 tetrahedra, corners with three equivalent Cd(2)As4 tetrahedra, edges with six equivalent Ce(1)As6 octahedra, edges with three equivalent Cd(1)As4 tetrahedra, and edges with three equivalent Cd(2)As4 tetrahedra. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one As(4) and three equivalent As(2) atoms to form CdAs4 tetrahedra that share corners with three equivalent Ce(1)As6 octahedra, corners with seven equivalent Cd(1)As4 tetrahedra, and edges with three equivalent Ce(1)As6 octahedra. The corner-sharing octahedral tilt angles are 10°. In the second Cd site, Cd(2) is bonded to one As(3) and three equivalent As(1) atoms to form CdAs4 tetrahedra that share corners with three equivalent Ce(1)As6 octahedra, corners with seven equivalent Cd(2)As4 tetrahedra, and edges with three equivalent Ce(1)As6 octahedra. The corner-sharing octahedral tilt angles are 10°. In the third Cd site, Cd(3) is bonded in a trigonal planar geometry to three equivalent As(3) atoms. In the fourth Cd site, Cd(4) is bonded in a trigonal planar geometry to three equivalent As(4) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Ce(1) and three equivalent Cd(2) atoms to form AsCe3Cd3 octahedra that share corners with three equivalent As(2)Ce3Cd3 octahedra, corners with three equivalent As(3)Cd5 trigonal bipyramids, edges with three equivalent As(2)Ce3Cd3 octahedra, and edges with six equivalent As(1)Ce3Cd3 octahedra. The corner-sharing octahedra are not tilted. In the second As site, As(2) is bonded to three equivalent Ce(1) and three equivalent Cd(1) atoms to form AsCe3Cd3 octahedra that share corners with three equivalent As(1)Ce3Cd3 octahedra, corners with three equivalent As(4)Cd5 trigonal bipyramids, edges with three equivalent As(1)Ce3Cd3 octahedra, and edges with six equivalent As(2)Ce3Cd3 octahedra. The corner-sharing octahedra are not tilted. In the third As site, As(3) is bonded to two equivalent Cd(2) and three equivalent Cd(3) atoms to form AsCd5 trigonal bipyramids that share corners with six equivalent As(1)Ce3Cd3 octahedra and corners with six equivalent As(3)Cd5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-71°. In the fourth As site, As(4) is bonded to two equivalent Cd(1) and three equivalent Cd(4) atoms to form AsCd5 trigonal bipyramids that share corners with six equivalent As(2)Ce3Cd3 octahedra and corners with six equivalent As(4)Cd5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-71°.
Ce(CdAs)3 crystallizes in the monoclinic Pm space group. Ce(1) is bonded to three equivalent As(1) and three equivalent As(2) atoms to form CeAs6 octahedra that share corners with three equivalent Cd(1)As4 tetrahedra, corners with three equivalent Cd(2)As4 tetrahedra, edges with six equivalent Ce(1)As6 octahedra, edges with three equivalent Cd(1)As4 tetrahedra, and edges with three equivalent Cd(2)As4 tetrahedra. All Ce(1)-As(1) bond lengths are 3.08 Å. All Ce(1)-As(2) bond lengths are 3.08 Å. There are four inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one As(4) and three equivalent As(2) atoms to form CdAs4 tetrahedra that share corners with three equivalent Ce(1)As6 octahedra, corners with seven equivalent Cd(1)As4 tetrahedra, and edges with three equivalent Ce(1)As6 octahedra. The corner-sharing octahedral tilt angles are 10°. The Cd(1)-As(4) bond length is 2.73 Å. There are a spread of Cd(1)-As(2) bond distances ranging from 2.80-2.82 Å. In the second Cd site, Cd(2) is bonded to one As(3) and three equivalent As(1) atoms to form CdAs4 tetrahedra that share corners with three equivalent Ce(1)As6 octahedra, corners with seven equivalent Cd(2)As4 tetrahedra, and edges with three equivalent Ce(1)As6 octahedra. The corner-sharing octahedral tilt angles are 10°. The Cd(2)-As(3) bond length is 2.72 Å. All Cd(2)-As(1) bond lengths are 2.81 Å. In the third Cd site, Cd(3) is bonded in a trigonal planar geometry to three equivalent As(3) atoms. There are a spread of Cd(3)-As(3) bond distances ranging from 2.59-2.62 Å. In the fourth Cd site, Cd(4) is bonded in a trigonal planar geometry to three equivalent As(4) atoms. There are a spread of Cd(4)-As(4) bond distances ranging from 2.58-2.62 Å. There are four inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Ce(1) and three equivalent Cd(2) atoms to form AsCe3Cd3 octahedra that share corners with three equivalent As(2)Ce3Cd3 octahedra, corners with three equivalent As(3)Cd5 trigonal bipyramids, edges with three equivalent As(2)Ce3Cd3 octahedra, and edges with six equivalent As(1)Ce3Cd3 octahedra. The corner-sharing octahedra are not tilted. In the second As site, As(2) is bonded to three equivalent Ce(1) and three equivalent Cd(1) atoms to form AsCe3Cd3 octahedra that share corners with three equivalent As(1)Ce3Cd3 octahedra, corners with three equivalent As(4)Cd5 trigonal bipyramids, edges with three equivalent As(1)Ce3Cd3 octahedra, and edges with six equivalent As(2)Ce3Cd3 octahedra. The corner-sharing octahedra are not tilted. In the third As site, As(3) is bonded to two equivalent Cd(2) and three equivalent Cd(3) atoms to form AsCd5 trigonal bipyramids that share corners with six equivalent As(1)Ce3Cd3 octahedra and corners with six equivalent As(3)Cd5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-71°. In the fourth As site, As(4) is bonded to two equivalent Cd(1) and three equivalent Cd(4) atoms to form AsCd5 trigonal bipyramids that share corners with six equivalent As(2)Ce3Cd3 octahedra and corners with six equivalent As(4)Cd5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 62-71°.