Anomalous behaviour of ε and tan δ in the paraelectric phase was found for PbZr0.992Ti0.008O3 single crystal. In the vicinity of temperatures 280–290°C (T c = 236°C) the pyroelectric effect was also observed. Using the data obtained, the existence of an additional polarization (polar regions oriented in an external electric field) in the paraelectric phase is discussed.
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Krystian Roleder (1989) studied this question.
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