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首页> 外文期刊>Physical review >Reduction of the electrocaloric entropy change of ferroelectric PbZr_(1-x)Ti_xO_3 epitaxial layers due to an elastocaloric effect
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Reduction of the electrocaloric entropy change of ferroelectric PbZr_(1-x)Ti_xO_3 epitaxial layers due to an elastocaloric effect

机译：由于弹性热效应，减少了铁电PbZr_（1-x）Ti_xO_3外延层的电热熵变

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摘要

We report laser-based direct measurements of the pyroelectric and electrocaloric effects of PbZr_(1-x)Ti_xO_3 epitaxial layers as a function of temperature and electric field. By evaluating the differences between the total pyroelectric and electrocaloric coefficients, we determine the secondary contribution to the electrocaloric effect that is created by a combination of piezoelectric and elastocaloric effects. The secondary contribution to the electrocaloric coefficient has the opposite sign as the primary effect and therefore reduces the overall entropy change of PbZr_(1-x)Ti_xO_3 in an electric field. The absolute magnitude of the secondary effect is comparable to the primary effect at elevated temperatures of ≈200 ℃.
机译：我们报告了基于激光的PbZr_（1-x）Ti_xO_3外延层的热电和电热效应作为温度和电场的函数的直接测量。通过评估总热电系数和电热系数之间的差异，我们确定了对压电和弹性热的结合所产生的电热效应的次要贡献。对电热系数的次要贡献具有与主要作用相反的符号，因此减少了电场中PbZr_（1-x）Ti_xO_3的总体熵变。在≈200℃的高温下，次级效应的绝对值与初级效应相当。

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  • 来源
    《Physical review》 |2014年第9期|094116.1-094116.8|共8页
  • 作者

    Trong Tong; J. Karthik; R. V. K. Mangalam; Lane W. Martin; David G. Cahill;

  • 作者单位

    Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 USA;

    Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 USA;

    Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 USA;

    Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 USA;

    Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 USA;

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  • 正文语种 eng
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  • 关键词

    pyroelectric and electrocaloric effects;

    机译：热电和电热效应;

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