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某些钙钛矿弛豫铁电晶体中布里渊光散射的异常现象。

Anomalies of Brillouin Light Scattering in Selected Perovskite Relaxor Ferroelectric Crystals.

作者信息

Sivasubramanian Venkatasubramanian, Ganesamoorthy Sarveswaran, Kojima Seiji

机构信息

Condensed Matter Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India.

Homi Bhabha National Institute, Mumbai 400094, India.

出版信息

Materials (Basel). 2023 Jan 8;16(2):605. doi: 10.3390/ma16020605.

DOI:10.3390/ma16020605
PMID:36676345
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9866364/
Abstract

Compositionally disordered perovskite compounds have been one of the exotic topics of research during the past several years. Colossal piezoelectric and electrostrictive effects have been observed in disordered perovskite ferroelectric materials. The key ingredient in the physical behavior of disordered perovskites is the nucleation and growth of the local dipolar regions called polar nanoregions (PNRs). PNRs begin to nucleate far above the temperature of the dielectric maximum and exhibit varied relaxation behavior with temperature. The evidence for the existence of various stages in the relaxation dynamics of PNRs was revealed through the study of the temperature evolution of optical phonons by Raman scattering. The quasi-static regime of PNRs is characterized by the strong coupling between the local polarization and strain with the local structural phase transition and the critical slowing of the relaxation time. Strong anomalies in the frequency and the width of the acoustic phonons, and emergence of the central peak in the quasi-static region of the relaxation dynamics of PNRs have been observed through Brillouin scattering studies. In this review, we discuss the anomalies observed in Brillouin scattering in selected disordered perovskite ferroelectrics crystals such as Pb(MgTa)O Pb(ScTa)O, 0.65PIN-0.35PT and SrCaTiO to understand dynamical behavior of PNRs.

摘要

在过去几年中，成分无序的钙钛矿化合物一直是热门的研究课题之一。在无序钙钛矿铁电材料中观察到了巨大的压电和电致伸缩效应。无序钙钛矿物理行为的关键因素是称为极性纳米区域（PNRs）的局部偶极区域的成核和生长。PNRs在远高于介电最大值的温度下开始成核，并随温度表现出不同的弛豫行为。通过拉曼散射研究光学声子的温度演化，揭示了PNRs弛豫动力学中存在不同阶段的证据。PNRs的准静态状态的特征是局部极化和应变与局部结构相变之间的强耦合以及弛豫时间的临界减慢。通过布里渊散射研究，观察到了声学声子频率和宽度的强烈异常，以及PNRs弛豫动力学准静态区域中中心峰的出现。在这篇综述中，我们讨论了在选定的无序钙钛矿铁电晶体（如Pb(MgTa)O、Pb(ScTa)O、0.65PIN-0.35PT和SrCaTiO）中布里渊散射观察到的异常，以了解PNRs的动力学行为。

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