Abstract
Amplitude dependences of dielectric permittivity ɛ and dielectric losses tanδ in K0.88(NH4)0.12H2PO4 mixed crystal near the ferroelectric phase transition temperature TC are investigated. At measurement fields E∼ exceeding some critical value, dependence tanδ(E∼) can be described within a model that includes the depinning of domain walls from point lattice defects. The activation field is found to grow appreciably when approaching TC from below, due to the presence of nonpolar regions.
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