Abstract
The role of glide planes in the organization of structures is shown based on a crystallographic analysis of the monoclinic structures of TlAs3S5 and Tl2(As,Sb)3S13 sulfides. In the first structure, cations and anions form systems (with identical geometries) of two face-centered sublattices, linked by the c plane, with the effect of unified “two-dimensional” (2D) ordering. The second structure, exhibiting signs of order–disorder (OD) type, is interpreted as a superposition of two noncentrosymmetric components with independent cation and anion sublattices, which, however, also form a regular 2D order due to the n plane. The stabilizing role of Tl cations in the geometry of cation matrices is indicated.
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Original Russian Text © S.V. Borisov, S.A. Magarill, N.V. Pervukhina, 2016, published in Kristallografiya, 2016, Vol. 61, No. 2, pp. 173–178.
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Borisov, S.V., Magarill, S.A. & Pervukhina, N.V. Glide planes symmetry in the organization of some sulfide structures. Crystallogr. Rep. 61, 153–158 (2016). https://doi.org/10.1134/S1063774516020061
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DOI: https://doi.org/10.1134/S1063774516020061