Materials Data on RbMg6Sb by Materials Project
RbMg6Sb crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Rb is bonded in a 4-coordinate geometry to eight Mg and two equivalent Sb atoms. There are a spread of Rb–Mg bond distances ranging from 3.83–4.14 Å. Both Rb–Sb bond lengths are 3.79 Å. There are four inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted single-bond geometry to one Rb, four Mg, and one Sb atom. There are two shorter (3.06 Å) and two longer (3.11 Å) Mg–Mg bond lengths. The Mg–Sb bond length is 3.06 Å. In the second Mg site, Mg is bonded in a 2-coordinate geometry to two equivalent Rb, one Mg, and two equivalent Sb atoms. The Mg–Mg bond length is 3.37 Å. Both Mg–Sb bond lengths are 3.00 Å. In the third Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Rb and eight Mg atoms. Both Mg–Mg bond lengths are 3.10 Å. In the fourth Mg site, Mg is bonded in a distorted hexagonal planar geometry to six Mg atoms. Sb is bonded in a 8-coordinate geometry to two equivalent Rb and six Mg atoms.