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The process of the polarisation reversal within the commensurate ferroelectric structure is discussed. The nucleation theory is used to calculate the switching time and the coercive field epsilon c . It is shown that epsilon c decreases critically on approaching the transition to the incommensurate phase, which represents one of the first examples for precursor phenomena within the commensurate phase.
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P. Prelovšek (1984) studied this question.
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