Materials Data on Ag6HgGeSe6 by Materials Project
Ag6HgGeSe6 crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. there are four inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded to four Se2- atoms to form AgSe4 tetrahedra that share corners with two equivalent GeSe4 tetrahedra and corners with six equivalent AgSe4 tetrahedra. There are one shorter (2.65 Å) and three longer (2.83 Å) Ag–Se bond lengths. In the second Ag1+ site, Ag1+ is bonded to four Se2- atoms to form distorted AgSe4 tetrahedra that share corners with two equivalent GeSe4 tetrahedra, corners with four AgSe4 tetrahedra, and an edgeedge with one AgSe4 tetrahedra. There are a spread of Ag–Se bond distances ranging from 2.71–2.78 Å. In the third Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three Se2- atoms. There are a spread of Ag–Se bond distances ranging from 2.63–2.70 Å. In the fourth Ag1+ site, Ag1+ is bonded in a 3-coordinate geometry to three Se2- atoms. There are a spread of Ag–Se bond distances ranging from 2.61–2.66 Å. Hg2+ is bonded in a bent 150 degrees geometry to two Se2- atoms. There are one shorter (2.51 Å) and one longer (2.61 Å) Hg–Se bond lengths. Ge4+ is bonded to four Se2- atoms to form GeSe4 tetrahedra that share corners with six AgSe4 tetrahedra. There are a spread of Ge–Se bond distances ranging from 2.37–2.39 Å. There are five inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to three Ag1+ and one Hg2+ atom. In the second Se2- site, Se2- is bonded to three Ag1+ and one Ge4+ atom to form corner-sharing SeAg3Ge tetrahedra. In the third Se2- site, Se2- is bonded to three Ag1+ and one Ge4+ atom to form corner-sharing SeAg3Ge tetrahedra. In the fourth Se2- site, Se2- is bonded to three Ag1+ and one Ge4+ atom to form distorted corner-sharing SeAg3Ge tetrahedra. In the fifth Se2- site, Se2- is bonded in a 7-coordinate geometry to six Ag1+ and one Hg2+ atom.
- Research Organization:
- LBNL Materials Project; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Contributing Organization:
- The Materials Project; MIT; UC Berkeley; Duke; U Louvain
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1729205
- Report Number(s):
- mp-1229209
- Country of Publication:
- United States
- Language:
- English
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