Synthesis and structure of a new quaternary rare-earth sulfide, La{sub 6}MgGe{sub 2}S{sub 14}, and the related compound La{sub 6}MgSi{sub 2}S{sub 14}
- Cornell Univ., Ithaca, NY (United States); and others
A new quaternary rare-earth sulfide has been isolated and identified. Crystals of La{sub 6}MgGe{sub 2}S{sub 14}, as well as of the previously identified La{sub 6}MgSi{sub 2}S{sub 14} have been grown from a mixed binary-halide eutectic flux. They both crystallize in the hexagonal space group C{sup 6}{sub 6}-P6{sub 3}, with Z = 1. The crystal structures of these compounds have been determined by single-crystal X-ray diffraction techniques. Crystal data are La{sub 6}MgGe{sub 2}S{sub 14} - a = 10.367(1) {angstrom}, c = 5.814(1) {angstrom} (T = 298 K), V = 541.09(8) {angstrom}{sup 3}, R{sub w}(F{sup 2}) = 0.050, R{sub 1} (on F) = 0.018; La{sub 6}MgSi{sub 2}S{sub 14} - a = 10.363(2) {angstrom} c = 5.742(1) {angstrom} (T = 298 K), V = 534.1(2) {angstrom}{sup 3}, R{sub w}(F{sup 2}) = 0.058, and R{sub 1} (on F) = 0.022. Structurally, these compounds belong to the Ln{sub 6}M{sub 2}M{prime}{sub 2}S{sub 14} family (Ln = rare-earth, M = first-row transition metal or main-group metal, M{prime} = main-group metal). Their structures are characterized by one-dimensional chains of MS{sub 6} face-sharing octahedra running parallel to the 6{sub 3} axis, surrounded by isolated M{prime}S{sub 4} tetrahedra aligned along the three-fold axes.
- OSTI ID:
- 576444
- Journal Information:
- Journal of Solid State Chemistry, Vol. 131, Issue 2; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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