Materials Data on Al2HgS4 by Materials Project
HgAl2S4 crystallizes in the tetragonal I-4 space group. The structure is three-dimensional. Hg2+ is bonded to four equivalent S2- atoms to form HgS4 tetrahedra that share corners with eight AlS4 tetrahedra. All Hg–S bond lengths are 2.59 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to four equivalent S2- atoms to form AlS4 tetrahedra that share corners with four equivalent HgS4 tetrahedra and corners with four equivalent AlS4 tetrahedra. All Al–S bond lengths are 2.28 Å. In the second Al3+ site, Al3+ is bonded to four equivalent S2- atoms to form AlS4 tetrahedra that share corners with four equivalent HgS4 tetrahedra and corners with four equivalent AlS4 tetrahedra. All Al–S bond lengths are 2.28 Å. S2- is bonded in a trigonal non-coplanar geometry to one Hg2+ and two Al3+ atoms.