Variation of the lattice parameters of TlTl_1-xIn_xSe₂ chain mixed crystals with composition have been studied by X-ray diffraction technique. The lattice anisotropy ( c/a ) of the TlBX₂-type mixed crystals changes linearly with substitution of the atoms located both at the center and at the vertices of the BX₄ tetrahedra. A brief survey of the important features of the effect of isomorphic atom substitution on the lattice anisotropy of TlBX₂-type mixed crystals with chain structure has been presented.

Keywords: X-ray diffraction, lattice anisotropy, chain mixed crystals

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