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首页> 外文期刊>Phase Transitions >Thermal hysteresis across the first-order phase transition in the (Na0.5Bi0.5)(1-x)BaxTiO3 dielectric system
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Thermal hysteresis across the first-order phase transition in the (Na0.5Bi0.5)(1-x)BaxTiO3 dielectric system

机译：（Na0.5Bi0.5）（1-x）BaxTiO3介电系统中一阶相变的热滞

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摘要

Results of capacitance versus temperature (C vs. T) measurements obtained in both warming and cooling of bulk samples of (Na0.5Bi0.5)(1-x)BaxTiO3 in the temperature range 50-350 degrees C are presented for the demonstration of generic features associated with a first-order phase transition (FOPT) in a dielectric system. Using the technique of minor hysteresis loops, initiated from the two branches (i.e., warming and cooling) in the irreversible regime of the overall CT hysteresis loop, the presence of phase coexistence of the ferroelectric phase (FP) and paraelectric phase (PP) arising due to the FOPT is substantiated. This observed metastable behavior of capacitance with the cycling of sample temperature near the phase transition is readily explained on the basis of supercooling and superheating of the two phases within the purview of the Landau theory.
机译：展示了在50-350摄氏度的温度范围内对（Na0.5Bi0.5）（1-x）BaxTiO3的大量样品进行加热和冷却时获得的电容对温度（C对T）的测量结果。与介电系统中的一阶相变（FOPT）相关的一般特征。在整个CT磁滞回线的不可逆状态下，使用从两个分支（即，加热和冷却）启动的微小磁滞回线技术，出现了铁电相（FP）和顺电相（PP）的相共存由于FOPT被证实。在Landau理论的研究范围内，基于两相的过冷和过热，很容易解释了这种随着样品温度在相变附近循环而引起的电容的亚稳态行为。

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