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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Tl4HgBr6 by Materials Project

Tl4HgBr6 crystallizes in the tetragonal P4/mnc space group. The structure is three-dimensional. Hg2+ is bonded in an octahedral geometry to six Br1- atoms. There are two shorter (2.60 Å) and four longer (3.12 Å) Hg–Br bond lengths. Tl1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of Tl–Br bond distances ranging from 3.32–3.84 Å. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 7-coordinate geometry to one Hg2+ and six equivalent Tl1+ atoms. In the second Br1- site, Br1- is bonded to one Hg2+ and four equivalent Tl1+ atoms to form distorted corner-sharing BrTl4Hg square pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TlHg5Br11 by Materials Project

Hg5TlBr11 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two Hg5TlBr11 sheets oriented in the (0, 1, 0) direction. there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to three Br1- atoms. There are a spread of Hg–Br bond distances ranging from 2.47–3.35 Å. In the second Hg2+ site, Hg2+ is bonded in a distorted linear geometry to six Br1- atoms. There are two shorter (2.47 Å) and four longer (3.54 Å) Hg–Br bond lengths. Tl1+ is bonded in a 10-coordinate geometry to ten Br1- atoms. There are a spread of Tl–Br bond distances ranging from 3.48–4.08 Å. There are four inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted single-bond geometry to one Hg2+ atom. In the second Br1- site, Br1- is bonded in a distorted single-bond geometry to one Hg2+ and one Tl1+ atom. In the third Br1- site, Br1- is bonded to four equivalent Hg2+ and two equivalent Tl1+ atoms to form corner-sharing BrTl2Hg4 octahedra. The corner-sharing octahedral tilt angles are 0°. In the fourth Br1- site, Br1- is bonded in a distorted single-bond geometry to two Hg2+ and one Tl1+ atom.

36 MATERIALS SCIENCE↗