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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Electric-field-induced local structural phenomena in Pb-based ABO3-type relaxor ferroelectrics
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Electric-field-induced local structural phenomena in Pb-based ABO3-type relaxor ferroelectrics

机译：铅基ABO 3 型弛豫铁电体中电场引起的局部结构现象

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摘要

Lead-based ABO-type relaxors and related systems have numerous applications in modern technical devices because of their remarkably high dielectric permittivity and piezoelectric/electroelastic and electro-optic coefficients. However, lead is not desired from an environmental point of view, and to switch to alternative alkali-, Ba-, or Bi-based relaxor systems, one must understand in great detail the structural mesoscopic order and coupling processes responsible for the outstanding performance and multifunctionality of the exemplar Pb-based compounds. To elucidate the type of ferroic coupling, three relaxor compounds PbScTaO (PST), PbBaScTaO (PST-Ba), and PbScNbO (PSN), were studied by polarized Raman scattering and acoustic emission at different temperatures and under an external electric field. The results reveal the coexistence of mesoscopic-scale ferroelectric and antiferroelectric coupling, which are predominantly related to B-site cations and A-site Pb cations, respectively. This suggests that the polar structural state of relaxors is frustrated ferrielectric. The presence of A-site cations with affinity to off-center is significant for the development of mesoscopic-scale antiferroelectric order coexisting with the mesoscopic-scale ferroelectric order.
机译：铅基ABO型弛豫器和相关系统因其极高的介电常数以及压电/电弹性和电光系数而在现代技术设备中具有众多应用。但是，从环境的角度来看，不需要铅，而要切换到其他基于碱，钡或铋的弛豫系统，则必须非常详细地了解结构介观的顺序和耦合过程，这些都是导致出色性能和可靠性的原因。典型的基于铅的化合物的多功能性。为了阐明铁磁耦合的类型，在不同温度和外部电场下，通过极化拉曼散射和声发射研究了三种弛豫化合物PbScTaO（PST），PbBaScTaO（PST-Ba）和PbScNbO（PSN）。结果表明介观规模的铁电和反铁电耦合共存，分别主要与B位阳离子和A位Pb阳离子有关。这表明弛豫器的极性结构状态是受阻的铁电体。对偏心亲和力具有亲和力的A-位阳离子的存在对于与介观规模铁电有序共存的介观规模反铁电有序的发展具有重要意义。

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