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摘要
Ba0.60Sr0.40TiO3 ceramic ferroelectric (FE) has been investigated in the wide temperature range under a dc external electric field (E) by means of dedicated acoustic emission (AE) method. The Curie point T-c = 9 degrees C, as well as both the temperature points, characteristic of relaxor ferroelectrics (RFEs), Burns temperature T-d = 283 degrees C and intermediate temperature T* = 182 degrees C have successfully been detected. T-c demonstrates a nontrivial behavior in dependence on E, i.e., initially it decreases, reaches a minimum of T-th = 1.2 degrees C at the small threshold field E-th = 0.75 kV cm(-1), and then starts to increase similar to ordered FEs, as E increases. The AE count rate, accompanying this nontrivial behavior of T-c(E) dependence, exhibits a pronounced maximum approximate to 5.4 s(-1) above E-th at the E-m = 1.5 kV cm(-1). Both, T-d and T* demonstrate a dependence on E, too, as was recently observed in relaxor FEs PbSc0.5Nb0.5O3 [Dul'kin et al., J. Appl. Phys. 113, 054105 (2013)]. The AE pronounced maximum is explained to be a consequence of the giant piezoelectric coefficients intrinsic to BaxSr1-xTiO3 FEs.
- 出版日期2014-7
- 单位同济大学
