Materials Data on ZnHg3Se3Br2 by Materials Project

Abstract

Hg3ZnSe3Br2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are six inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a square co-planar geometry to two equivalent Se2- and two equivalent Br1- atoms. Both Hg–Se bond lengths are 2.58 Å. Both Hg–Br bond lengths are 3.24 Å. In the second Hg2+ site, Hg2+ is bonded in a square co-planar geometry to two equivalent Se2- and two equivalent Br1- atoms. Both Hg–Se bond lengths are 2.54 Å. Both Hg–Br bond lengths are 3.34 Å. In the third Hg2+ site, Hg2+ is bonded in a distorted square co-planar geometry to four Br1- atoms. There are two shorter (2.48 Å) and two longer (3.25 Å) Hg–Br bond lengths. In the fourth Hg2+ site, Hg2+ is bonded in a distorted linear geometry to two equivalent Se2- and two equivalent Br1- atoms. Both Hg–Se bond lengths are 2.52 Å. Both Hg–Br bond lengths are 3.55 Å. In the fifth Hg2+ site, Hg2+ is bonded to two equivalent Se2- and four Br1- atoms to form distorted HgSe2Br4 octahedra that share corners with two equivalent ZnSe4 tetrahedra. Both Hg–Se bond lengths are 3.30 Å. There are two shorter (2.59 Å) and two longer (3.07 Å) Hg–Br bond lengths. In the sixth Hg2+ site, Hg2+ is bonded in a distorted square co-planar geometry to two equivalent Se2- and two equivalent Br1- atoms. Both Hg–Se bond lengths are 2.54 Å. Both Hg–Br bond lengths are 3.38 Å. Zn2+ is bonded to four Se2- atoms to form ZnSe4 tetrahedra that share a cornercorner with one HgSe2Br4 octahedra and an edgeedge with one ZnSe4 tetrahedra. The corner-sharing octahedral tilt angles are 74°. There are a spread of Zn–Se bond distances ranging from 2.46–2.63 Å. There are three inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted trigonal non-coplanar geometry to one Hg2+ and two equivalent Zn2+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to two Hg2+ and one Zn2+ atom. In the third Se2- site, Se2- is bonded in a 3-coordinate geometry to two Hg2+ and one Zn2+ atom. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to four Hg2+ atoms. In the second Br1- site, Br1- is bonded in a 1-coordinate geometry to four Hg2+ atoms.