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Quasi-one-dimensional domain walls in ferroelectric ceramics: Evidence from domain dynamics and wall roughness measurements

机译:铁电陶瓷准一维畴壁:畴动态和壁粗糙度测量的证据

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摘要

Direct measurements of the motion of domain walls in disordered ferroelectrics provide important information on their interaction with defects, which is crucial for the functioning of various ferroelectric devices such as high-K capacitors and ferroelectric-based memories. In this work, we report on the results of the nanoscale measurements of domain-wall velocity and static domain-wall roughness in disordered (Pb,La)(Zr,Ti)O_3 (PLZT) ceramics prepared by hot press sintering. Relaxation of domain walls to their equilibrium configurations at short length scales yields the apparent roughness exponent ζ≈ 0.67 in PLZT 9.5/65/35. At the same time, the dynamical exponent μ was found to be about 0.25 from the independent measurements of domain-wall creep under local application of electric field. An analysis of these two values points to the effective dimensionality d_eff = 1 for the domain walls in PLZT with high La content. This result is confirmed by the layer-by-layer polishing followed by the imaging of an artificially created domain. The origin of disorder and its dependence on La concentration in PLZT solid solutions are discussed. ~C 2011 American Institute of Physics.
机译:对无序铁电中畴壁运动的直接测量提供了有关其与缺陷相互作用的重要信息,这对于各种铁电设备(例如高K电容器和基于铁电的存储器)的功能至关重要。在这项工作中,我们报告了通过热压烧结制备的无序(Pb,La)(Zr,Ti)O_3(PLZT)陶瓷的畴壁速度和静态畴壁粗糙度的纳米级测量结果。在PLZT 9.5 / 65/35中,畴壁在短长度尺度上松弛到其平衡构型会产生表观粗糙度指数ζ≈0.67。同时,根据电场局部施加下的畴壁蠕变的独立测量,发现动力学指数μ约为0.25。对这两个值的分析指出,对于La含量高的PLZT中的畴壁,有效尺寸d_eff = 1。通过逐层抛光,然后对人工创建的区域进行成像,可以确认该结果。讨论了PLZT固溶体中无序的起源及其对La浓度的依赖性。 〜C 2011美国物理研究所。

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  • 来源
    《Journal of Applied Physics》 |2011年第v110n5期|p.052001.1-052001.5|共5页
  • 作者单位

    A. F. Ioffe Physico-Technical Institute, Russian Academy of Sciences, 194021 St Petersburg, Russia;

    Department of Ceramics and Glass Engineering & CICECO, University ofAveiro, 3810-193 Aveiro, Portugal,National University of Science and Technology "MISiS", 119049 Moscow, Russia;

    Department of Mechanical Engineering & TEMA, University ofAveiro, 3810-193 Aveiro, Portugal;

    Electronic Ceramics Department, Jozef Stefan Institute, Jamova 39,1000 Ljubljana, Slovenia;

    Department of Ceramics and Glass Engineering & CICECO, University ofAveiro, 3810-193 Aveiro, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-17 13:58:33

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