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Journal of Structural Chemistry

2013 year, number 5

X-RAY CRYSTALLOGRAPHIC ANALYSIS OF TL2S: AN EXAMPLE OF LAYERED ISOMORPHISM

S. V. Borisov, S. A. Magarill, N. V. Pervukhina
A. V. Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, Novosibirsk
Keywords: pseudo translational atomic sublattices, variation of the pbs structure type, layered isomorphism of cationic and anionic layers

Abstract

In the structure of Tl2S, the pseudo translational sublattice of Tl and S atoms with a rhombohedral primitive subcell aP = 3.09 Å, αP = 81.87° is determined. As opposed to the common PbS structure type, in which single (close-packed) layers of cations and anions alternate, in the structure of Tl2S, there is an alternation of double cationic layers with single anionic layer, while the general geometry of atomic positions (skeleton) of the PbS structure type is retained. Therewith, the atoms of a part of cationic layers occupy the atomic sites of the anionic layers and vice versa.