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首页> 外文期刊>Journal of materials science >High temperature ac conductivity relaxations in dielectric ceramics: grain boundary/intergranular phase effects
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High temperature ac conductivity relaxations in dielectric ceramics: grain boundary/intergranular phase effects

机译：介电陶瓷中的高温交流电导率松弛：晶界/晶间相位效应

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摘要

The electric polarization and dc conductivity as two main factors cause electric relaxation in dielectric ceramic, which are difficult to be distinguished from each other at high temperatures. In this work, it is found that the two key factors can be separated via conjoint analysis of various complex planes such as complex dielectric permittivity, the impedance, the electric modulus, and the ac conductivity planes. Taking ZnO ceramics as a typical example, the ac conductivity relaxations caused by the long range and short-range migration of charge carriers are discussed as a function of frequency at high temperatures (433-473 K). Under the applied ac electric field, the migration of charge carriers within the ZnO ceramic can be restricted by two high-resistance barriers from grain boundaries and intergranular phases. These barriers result in two dispersion processes in conductivity response, which exhibit two relaxation peaks with activation energies of 0.75 eV and 0.89 eV. It was proposed that, in high temperature region, the ac conductivity relaxations of ZnO ceramic are the result of carrier migration localized between grain boundaries, and carrier migration localized between intergranular phases.
机译：作为两个主要因素的电极化和直流电导率导致电介质陶瓷的电弛豫，这在高温下难以彼此区分。在这项工作中，发现两个关键因素可以通过各种复合平面的联想分析来分离，例如复杂的介电介电常数，阻抗，电模量和交流电导率平面。将ZnO陶瓷作为典型的例子，通过电荷载波的长距离和短距离迁移引起的交流电导率松弛作为高温下的频率（433-473K）。在应用的交流电场下，ZnO陶瓷内的电荷载体的迁移可以由来自晶界和晶间相的两个高电阻屏障限制。这些屏障导致导电响应中的两个分散过程，其具有0.75eV和0.89eV的活化能量的两个松弛峰。提出，在高温区域中，ZnO陶瓷的交流电导率松弛是载体迁移的结果，该载体迁移在晶状体边界之间局部化，并且在晶间相之间局部化的载流子迁移。

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  • 来源
    《Journal of materials science》 |2020年第19期|16468-16478|共11页
  • 作者

    Xuetong Zhao; Yupeng Li; Lulu Ren; Chao Xu; Jianjie Sun; Lijun Yang; Ruijin Liao;

  • 作者单位

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China;

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China;

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China;

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China State Grid Zhejiang Electric Power Co. Jiaxing Power Supply Company 314033 Jiaxing People's Republic of China;

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China;

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China;

    State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University. Shapingba District 400044 Chongqing People's Republic of China;

  • 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);
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