Materials Data on MgCuSb by Materials Project
MgCuSb is half-Heusler structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. Mg2+ is bonded to six equivalent Sb3- atoms to form distorted MgSb6 octahedra that share corners with six equivalent MgSb6 octahedra, corners with twelve equivalent CuSb4 tetrahedra, edges with twelve equivalent MgSb6 octahedra, and faces with four equivalent CuSb4 tetrahedra. The corner-sharing octahedral tilt angles are 0°. All Mg–Sb bond lengths are 3.12 Å. Cu1+ is bonded to four equivalent Sb3- atoms to form CuSb4 tetrahedra that share corners with twelve equivalent MgSb6 octahedra, corners with twelve equivalent CuSb4 tetrahedra, and faces with four equivalent MgSb6 octahedra. The corner-sharing octahedral tilt angles are 55°. All Cu–Sb bond lengths are 2.70 Å. Sb3- is bonded in a 10-coordinate geometry to six equivalent Mg2+ and four equivalent Cu1+ atoms.