CRYSTAL FORMATION FEATURES IN A SERIES OF CHALCOGENIDE STRUCTURES WITH MONOVALENT Tl. ORDERED PACKING EFFECT IN Tl COORDINATION
S. V. Borisov, S. A. Magarill, N. V. Pervukhina
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: crystallographic analysis, cationic and anionic sublattices, Tl-chalcogenides AgTlTe, vrbaite Hg3Tl4As8Sb2S20, gabrielite Tl2AgCu2As3S7, ordered packing effect in coordination, Tl+ coordination
Abstract
In order to determine the crystal- forming factors and reasons for irregular coordination of Tl+ cations the crystallographic analysis of the structure of AgTlTe (I), minerals vrbaite Hg3Tl4As8Sb2S20 (II) and gabrielite Tl2AgCu2As3S7 (III) is performed. For I and II the skeleton translational sublattices of all atoms in the structure with the determining contribution of Tl + and anions are found; for II and III the cationic and anionic along with Tl+ sublattices, which form the structure, are found. The incorporation of cations into the Tl+ coordination environment is classified as a consequence of the structure-forming ordering of Tl cations and anions (S, Te) in one matrix, i.e. as the effect of their ordered packing.
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