The effect of atomic ordering on displacive-type structural phase transitions is considered for crystals with several atomic sublattices. On the basis of group-theoretical analysis and general crystallographic and thermodynamic principles, it is shown that ordering gives rise to qualitative restructuring of phase diagrams and changes in atomic states up to the formation of new ferroelectric and ferroelastic phases proper. Specific physical properties of crystals provided by atomic ordering are considered in the vicinity of structural transitions within the framework of the phenomenological theory of phase transitions.
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Sakhnenko et al. (2003) studied this question.
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