Materials Data on Cs2HgBr4 by Materials Project
Cs2HgBr4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a 9-coordinate geometry to nine Br1- atoms. There are a spread of Cs–Br bond distances ranging from 3.73–4.29 Å. In the second Cs1+ site, Cs1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of Cs–Br bond distances ranging from 3.70–4.23 Å. Hg2+ is bonded in a tetrahedral geometry to four Br1- atoms. There are a spread of Hg–Br bond distances ranging from 2.64–2.69 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 3-coordinate geometry to four Cs1+ and one Hg2+ atom. In the second Br1- site, Br1- is bonded in a 1-coordinate geometry to five Cs1+ and one Hg2+ atom. In the third Br1- site, Br1- is bonded in a 1-coordinate geometry to four Cs1+ and one Hg2+ atom.