PrCd3P3 crystallizes in the hexagonal P6_3/mmc space group. Pr(1) is bonded to six equivalent P(2) atoms to form PrP6 octahedra that share corners with six equivalent Cd(2)P4 tetrahedra, edges with six equivalent Pr(1)P6 octahedra, and edges with six equivalent Cd(2)P4 tetrahedra. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a trigonal planar geometry to three equivalent P(1) atoms. In the second Cd site, Cd(2) is bonded to one P(1) and three equivalent P(2) atoms to form CdP4 tetrahedra that share corners with three equivalent Pr(1)P6 octahedra, corners with seven equivalent Cd(2)P4 tetrahedra, and edges with three equivalent Pr(1)P6 octahedra. The corner-sharing octahedral tilt angles are 11°. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Cd(2) and three equivalent Cd(1) atoms to form PCd5 trigonal bipyramids that share corners with six equivalent P(2)Pr3Cd3 octahedra and corners with six equivalent P(1)Cd5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 67°. In the second P site, P(2) is bonded to three equivalent Pr(1) and three equivalent Cd(2) atoms to form PPr3Cd3 octahedra that share corners with three equivalent P(2)Pr3Cd3 octahedra, corners with three equivalent P(1)Cd5 trigonal bipyramids, and edges with nine equivalent P(2)Pr3Cd3 octahedra. The corner-sharing octahedra are not tilted.
PrCd3P3 crystallizes in the hexagonal P6_3/mmc space group. Pr(1) is bonded to six equivalent P(2) atoms to form PrP6 octahedra that share corners with six equivalent Cd(2)P4 tetrahedra, edges with six equivalent Pr(1)P6 octahedra, and edges with six equivalent Cd(2)P4 tetrahedra. All Pr(1)-P(2) bond lengths are 2.99 Å. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a trigonal planar geometry to three equivalent P(1) atoms. All Cd(1)-P(1) bond lengths are 2.48 Å. In the second Cd site, Cd(2) is bonded to one P(1) and three equivalent P(2) atoms to form CdP4 tetrahedra that share corners with three equivalent Pr(1)P6 octahedra, corners with seven equivalent Cd(2)P4 tetrahedra, and edges with three equivalent Pr(1)P6 octahedra. The corner-sharing octahedral tilt angles are 11°. The Cd(2)-P(1) bond length is 2.60 Å. All Cd(2)-P(2) bond lengths are 2.69 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Cd(2) and three equivalent Cd(1) atoms to form PCd5 trigonal bipyramids that share corners with six equivalent P(2)Pr3Cd3 octahedra and corners with six equivalent P(1)Cd5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 67°. In the second P site, P(2) is bonded to three equivalent Pr(1) and three equivalent Cd(2) atoms to form PPr3Cd3 octahedra that share corners with three equivalent P(2)Pr3Cd3 octahedra, corners with three equivalent P(1)Cd5 trigonal bipyramids, and edges with nine equivalent P(2)Pr3Cd3 octahedra. The corner-sharing octahedra are not tilted.