Abstract
PbSc0.5Ta0.36Nb0.14O3 relaxor-ferroelectric crystals were studied by the means of dielectric and acoustic emission (AE) methods in the temperature range of 180–300 K. In zero dc electric field (E) no AE was detected at the smeared dielectric maximum Tm ≈ 260 K characteristic for canonical relaxor ferroelectrics. Under the E a phase transition appears at TC = 217 K for E ∼ 1 kV cm−1. The TC(E) dependence is linear with an anomaly point at E ∼ 1.3 kV cm−1, at which dTC/dE abruptly changes. At this E value the AE rate exhibits a maximum. The anomalous E point is assigned to be the critical end point for this solid solution.
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