Turkish Journal of Physics

Effect of Isomorphic Atom Substitution on Lattice Parameters of TlBX_{2}-type Mixed Crystals




The variation of the lattice parameters of TlBX_{2}-type mixed crystals with composition have been investigated by X-ray diffraction technique. The lattice anisotropy (c/a) of the mixed crystals changes linearly depending on substitution of the atoms located both at the centre and at the vertices of the BX_{4} tetrahedra. For some of the mixed crystals studied, structural phase transition (monoclinic \rightleftharpoons tetragonal) is observed due to atom substitution when the sum of tetrahedral covalent radii of the B and X atoms in BX_{4} tetrahedra reaches a critical value of about 0.255 nm.

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