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The interaction between soft-optical-mode coordinates and the elastic strain at structural phase transitions that have as soft modes linear combinations of the triply degenerate Γ₂₅ optical mode at the R corner of the Brillouin zone are discussed with the help of a model Hamiltonian. The effect of the interaction on the soft-mode frequencies, the angle of rotation, and the strain distortions are calculated. The theory is compared with experimental results for SrTiO₃ and LaAlO₃, and good agreement is obtained with the available experimental data.
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Feder et al. (1970) studied this question.
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