Materials Data on Cs3MgH5 by Materials Project
Cs3MgH5 crystallizes in the tetragonal P4/ncc space group. The structure is three-dimensional. there are two inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 6-coordinate geometry to six H1- atoms. There are a spread of Cs–H bond distances ranging from 3.15–3.41 Å. In the second Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to eight H1- atoms. There are a spread of Cs–H bond distances ranging from 3.10–3.42 Å. Mg2+ is bonded in a tetrahedral geometry to four equivalent H1- atoms. All Mg–H bond lengths are 1.87 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to six Cs1+ atoms to form corner-sharing HCs6 octahedra. The corner-sharing octahedra tilt angles range from 0–31°. In the second H1- site, H1- is bonded in a distorted single-bond geometry to four Cs1+ and one Mg2+ atom.