Materials Data on Ba(CdAs)2 by Materials Project

Abstract

Ba(CdAs)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Ba2+ is bonded to six equivalent As3- atoms to form BaAs6 octahedra that share corners with twelve equivalent CdAs4 tetrahedra, edges with six equivalent BaAs6 octahedra, and edges with six equivalent CdAs4 tetrahedra. All Ba–As bond lengths are 3.35 Å. Cd2+ is bonded to four equivalent As3- atoms to form CdAs4 tetrahedra that share corners with six equivalent BaAs6 octahedra, corners with six equivalent CdAs4 tetrahedra, edges with three equivalent BaAs6 octahedra, and edges with three equivalent CdAs4 tetrahedra. The corner-sharing octahedra tilt angles range from 20–52°. There are three shorter (2.78 Å) and one longer (2.85 Å) Cd–As bond lengths. As3- is bonded to three equivalent Ba2+ and four equivalent Cd2+ atoms to form a mixture of distorted corner and edge-sharing AsBa3Cd4 pentagonal bipyramids.