Materials Data on RbMg2 by Materials Project
RbMg2 crystallizes in the monoclinic P2_1/m space group. The structure is two-dimensional and consists of one RbMg2 sheet oriented in the (0, 0, 1) direction. Rb is bonded in a 8-coordinate geometry to two equivalent Rb and four Mg atoms. Both Rb–Rb bond lengths are 3.85 Å. There are two shorter (4.04 Å) and two longer (4.13 Å) Rb–Mg bond lengths. There are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to two equivalent Rb and six equivalent Mg atoms. There are a spread of Mg–Mg bond distances ranging from 3.09–3.15 Å. In the second Mg site, Mg is bonded in a 10-coordinate geometry to two equivalent Rb and eight Mg atoms. Both Mg–Mg bond lengths are 3.33 Å.
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