Abstract

The results of studies for thermal expansion and optical indicatrix rotation at the ferroelastic phase transition, along with the domain structure observations for Cs2HgCl4, Cs2HgBr4 and Cs2CdBr4 crystals are presented. On the basis of the literature data and the results of our studies for the heterophase structure, domain structure and thermal expansion, the phase diagram common for Cs2HgCl4, Cs2HgBr4 and Cs2CdBr4 crystals is proposed.

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