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A phenomenological model of helicoidal antiferroelectric liquid crystals is analysed and the relaxational eigenfrequencies of ferroelectric and antiferroelectric modes are evaluated in the smectic A phase, in the ferroelectric smectic C* phase and in the antiferroelectric phase. In the intermediate ferrielectric phase the eigenmodes are mixtures of ferroelectric and antiferroelectric fluctuations.
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Žekš et al. (1991) studied this question.
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