The dielectric constant ϵ′ c and the loss constant e“c of KDP crystals are measured in the ferroelectric phase versus the sample thickness t. It is experimentally demonstrated that the ϵ′c values change with t and become maximum for t approximately equal to one half of the other sample dimensions (in a axes directions). Then, it is shown that the domain freezing temperature T f which corresponds to the low temperature e“( T ) maximum, decreases with the sample thickness in a logarithmic law.
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Bornarel et al. (1992) studied this question.
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