Prolonged relaxation phenomena and related to them effects of temperature and field memory have been studied in ferroelectric PLZT and PMN ceramica in the region of a diffused phase transition. The given effects are observed in temperature and field dependences of permittivity ϵ after prolonged stabilization of temperature and a prolonged influence of static electric field smaller than the critical.
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Шильников et al. (1988) studied this question.
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