Materials Data on Hg2P2S7 by Materials Project
Hg2P2S7 crystallizes in the monoclinic C2 space group. The structure is three-dimensional. Hg2+ is bonded to four S2- atoms to form HgS4 tetrahedra that share corners with two equivalent HgS4 tetrahedra and corners with four equivalent PS4 tetrahedra. There are a spread of Hg–S bond distances ranging from 2.53–2.97 Å. P5+ is bonded to four S2- atoms to form PS4 tetrahedra that share a cornercorner with one PS4 tetrahedra and corners with four equivalent HgS4 tetrahedra. There are a spread of P–S bond distances ranging from 2.02–2.16 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a water-like geometry to one Hg2+ and one P5+ atom. In the second S2- site, S2- is bonded in a water-like geometry to one Hg2+ and one P5+ atom. In the third S2- site, S2- is bonded in a water-like geometry to two equivalent P5+ atoms. In the fourth S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Hg2+ and one P5+ atom.