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Multistep stochastic mechanism of polarization reversal in rhombohedral ferroelectrics

机译：菱面向铁电器极化逆转的多步随机机制

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摘要

A stochastic model for the field-driven polarization reversal in rhombohedral ferroelectrics is developed, providing a description of their temporal electromechanical response. Application of the model to simultaneous measurements of polarization and strain kinetics in a rhombohedral Pb(Zr, Ti)O3 ceramic over a wide time window allows the identification of preferable switching paths, fractions of individual switching processes, and their activation fields. In conjunction, the phenomenological Landau-Ginzburg-Devonshire theory is used to analyze the impact of an external field and stress on switching barriers, showing that residual mechanical stress may promote the fast switching.
机译：开发了一种用于菱形铁电解中的现场驱动极化反转的随机模型，提供了对其时间机电响应的描述。模型在宽时间窗口中rhombohedral Pb（Zr，Ti）O3陶瓷中偏振和菌株动力学同时测量的应用允许识别优选的开关路径，各个切换过程的分数及其激活场。结合，现象学Landau-Ginzburg-Devonshire理论用于分析外部场和应力对开关屏障的影响，表明剩余机械应力可以促进快速切换。

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  • 来源
    《Physical review》 |2020年第6期|064107.1-064107.12|共12页
  • 作者

    Y. A. Genenko; R. Khachaturyan; I. S. Vorotiahin; J. Schultheiss; J. E. Daniels; A. Gruenebohm; J. Koruza;

  • 作者单位

    Department of Materials and Earth Sciences Technical University of Darmstadt Otto-Berndt-Strasse 3 64287 Darmstadt Germany;

    Interdisciplinary Center for Advanced Materials Simulation Ruhr-Universitaet Bochum Universitaetsstrasse 150 44801 Bochum Germany;

    Department of Materials and Earth Sciences Technical University of Darmstadt Otto-Berndt-Strasse 3 64287 Darmstadt Germany;

    Department of Materials and Earth Sciences Technical University of Darmstadt Alarich-Weiss-Strasse 2 64287 Darmstadt Germany Department of Materials Science and Engineering NTNU Norwegian University of Science and Technology 7034 Trondheim Norway;

    School of Materials Science and Engineering UNSW Sydney New South Wales 2052 Australia;

    Interdisciplinary Center for Advanced Materials Simulation Ruhr-Universitaet Bochum Universitaetsstrasse 150 44801 Bochum Germany;

    Department of Materials and Earth Sciences Technical University of Darmstadt Alarich-Weiss-Strasse 2 64287 Darmstadt Germany;

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