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R. Tamazyan, H. Arnold, V. Molchanov, G. Kuzmicheva, I. Vasileva

Contribution to the crystal chemistry of rare earth chalcogenides. III. The crystal structure and twinning of SmS_1.9

The structure of samarium disulfide SmS_1.9, space group P4₂/n; lattice constants a = 19.717(2)Å ; c = 15.928(1) Å has been determined and refined by LS method to R = 0.0345; R_w = 0.0419. The structure is a tenfold superstructure from the structure type ZrSSi. [S2]^2– dumbbells with interatomic distances 2.146(1)Å between S atoms were observed in the structure. Fully ordered vacancies and orientation of the [S2]^2- dumbbells are responsible for the formation of the superstructure. The investigated sample was twinned by the reticular merohedral law, the twin symmetry is 4/mm´m´, the twinning symmetry elements are (310) and (120) mirror planes and the twin index is n=5.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 215, 06/2000
Pages: 346

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