Synthesis and structure of a new ternary silver-rich sulfide BaAg{sub 8}S{sub 5}
- Northern Illinois Univ., DeKalb, IL (United States)
A new ternary silver-rich sulfide, BaAg{sub 8}S{sub 5}, was synthesized. This solid-state compound crystallizes in the monoclinic, centrosymmetric space group P{sub 1}/m with a = 7.6720(2) {angstrom}, b = 17.6660(4) {angstrom}, c = 8.9370(2) {angstrom}, {beta} = 107.890(1){degree}, Z = 4, and V = 1152.70(5) {angstrom}{sup 3}. The refinement results are R1 = 0.0490 and wR2 = 0.1136 for 1 > 2{sigma}(I) using 2552 reflections and 137 parameters. As in the binary {alpha}-Ag{sub 2}S and {beta}-Ag{sub 2}S solids, the coordination geometry of both Ag and S is complex. However, if only the bonding of Ag to S is concerned, the arrangement is simple. Ag of the first type is connected to two S atoms in both linear and bent fashions. Ag of the second type is coordinated to three S atoms in a pyramidal shape. The structure can be viewed as a three-dimensional network formed by Ag and S atoms with Ba atoms occupying channels parallel to the c axis. Theoretical analysis using the extended Hueckel method indicates that the solid should be a semiconductor.
- OSTI ID:
- 351521
- Journal Information:
- Journal of Solid State Chemistry, Vol. 144, Issue 2; Other Information: PBD: May 1999
- Country of Publication:
- United States
- Language:
- English
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