arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.05286cond-mat.mtrl-sci
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重入弛豫0.6Bi(Mg1/2Ti1/2)O3-0. 4PbTiO 3中极性纳米区的动力学行为

Dynamic behavior of polar nanoregions in re-entrant relaxor 0.6Bi(Mg1/2Ti1/2)O3-0.4PbTiO3

Kaiyuan Chen, Qi Zhang, Jia Liu, Jie Wang, Zhencheng Lan, Liang Fang, Changzheng Hu, Nengneng Luo, Biaolin Peng, Changbai Long, Dawei Wang, Laijun Liu

摘要:

极性纳米区的存在是弛豫铁电体最重要的特性,然而,PNR的尺寸确定和动力学仍然不确定。我们发现复合钙钛矿氧化物0.6Bi(Mg_(1/2)Ti_(1/2))O_3 - 0.4PbTiO_3中同时存在重入弛豫行为和铁电-顺电转变。用唯象统计模型描述了两种介电反常现象:低温再入弛豫相变和高温扩散相变。得到了对应于两种铁电态的两种极性纳米区的尺寸。利用等温电模量分析了PNR的动力学过程,发现PNR的扩散相变、形成和凝固存在3个临界温度。PNR演化的温度演化取决于铋的化学计量。研究结果为PNR的动力学行为和重入弛豫行为的调控提供了新的思路。

英文摘要:

The existence of polar nanoregions is the most important characteristic of ferroelectric relaxors, however, the size determination and dynamic of PNRs remains uncertain. We reveal a re-entrant relaxor behavior and ferroelectric-paraelectric transition coexists in complex perovskite oxide 0.6Bi(Mg1/2Ti1/2)O3-0.4PbTiO3. Two dielectric anomalies (i) the low-temperature re-entrant relaxor transition and (ii) the high-temperature diffuse phase transition (DPT) were described by the phenomenological statistical model. The sizes of the two kinds of polar nanoregions (PNRs) corresponding to two ferroelectric states were obtained. The dynamic of PNRs were analyzed using isothermal electrical modulus, which shows three critical temperatures associated with the diffuse phase transition, the formation and freezing of PNRs, respectively. The temperature evolution of the PNRs evolution depends on the stoichiometry of bismuth. The results provide new insights into the dynamic behavior of PNRs and the modification way of re-entrant relaxor behavior.

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