Abstract
In situ observation of the ferroelectric phase transition in Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZNT91/9) single crystals has been carried out by white-beam synchrotron radiation X-ray topography. Sequent phase transitions are confirmed by the dynamic behavior of the domain configuration in the PZNT crystal upon heating, which exhibits good agreement with dielectric measurement of the same sample. Such ferroelectric transitions exhibit a first-order-transition character observed by the dynamic property of the domain structure combined with dielectric measurement. Abnormal fluctuation of domain walls is observed around temperatures for which phase transitions occur, which cannot be interpreted by the nature of the ferroelectric phase transition. Such interesting phenomena are supposed to be related to nucleation and growth of domains and lattice distortion induced by thermal stress. An interpretation is put forward regarding the influence of temperature on the domain-wall energy and the potential barrier surmounted for domain reversal combined with a thermal stress-induced domain effect. This experiment furnishes an understanding of the nature of a first-order ferroelectric phase transition with some diffused character. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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