Abstract
By the experiments studying the FR(LT)–FR(HT) phase transition of PZT ceramics, it is reasonable to point out that the FR(HT) phase transition is of first order. The convincing experimental results show that during FR(LT)–FR(HT) transition, an anomalous behaviour of specific heat, abrupt volume change in thermal expansion, shift of phase transition temperature under dc bias, thermal hysteresis of pyroelectric current, and structural change from one space group to another take place.
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