Materials Data on RbMg6C by Materials Project

Abstract

RbMg6C crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Rb is bonded in a 10-coordinate geometry to two equivalent Rb and six Mg atoms. Both Rb–Rb bond lengths are 3.36 Å. There are two shorter (3.75 Å) and four longer (3.76 Å) Rb–Mg bond lengths. There are four inequivalent Mg sites. In the first Mg site, Mg is bonded in a 1-coordinate geometry to two equivalent Mg atoms. Both Mg–Mg bond lengths are 3.26 Å. In the second Mg site, Mg is bonded in an L-shaped geometry to two equivalent Rb, one Mg, and two equivalent C atoms. The Mg–Mg bond length is 3.26 Å. Both Mg–C bond lengths are 2.36 Å. In the third Mg site, Mg is bonded in a water-like geometry to two equivalent Rb and two equivalent C atoms. Both Mg–C bond lengths are 2.22 Å. In the fourth Mg site, Mg is bonded in a 8-coordinate geometry to eight Mg atoms. Both Mg–Mg bond lengths are 3.36 Å. C is bonded in a 6-coordinate geometry to six Mg atoms.