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首页> 外文期刊>Physical review >Interplay of conventional with inverse electrocaloric response in (Pb,Nb)(Zr,Sn,Ti)O_3 antiferroelectric materials
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Interplay of conventional with inverse electrocaloric response in (Pb,Nb)(Zr,Sn,Ti)O_3 antiferroelectric materials

机译：（Pb，Nb）（Zr，Sn，Ti）O_3反铁电材料中常规与反电热响应的相互作用

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摘要

The electrocaloric effect in ferroics is considered a powerful solid-state cooling technology. Its potential is enhanced by correlation to the inverse electrocaloric effect and leads into mechanisms of decreasing or increasing dipolar entropy under applied electric field. Nevertheless, the mechanism underlying the increase of the dipolar entropy with applied electric field remains unclear and controversial. This study investigates the electrocaloric response of the antiferroelectric Pb_(0.99)Nb_(0.02)[(Zr_(0.58)Sn_(0.43))_(0.92)Ti_(0.08)]_(0.98)O_3 in which the critical electric field is low enough to induce the ferroelectric phase over a broad temperature range. Utilizing temperature- and electric-field-dependent dielectric measurements, direct electrocaloric measurements, and in situ transmission electron microscopy, a crossover from conventional to inverse electrocaloric response is demonstrated. The origin of the inverse electrocaloric effect is rationalized by investigating the field-induced phase transition between antiferroelectric and ferroelectric phases. The disappearance of the latent heat at field-induced transition coincides with the crossover of the electrocaloric effect and demonstrates that the overall electrocaloric response is an interplay of different entropy contributions. This opens new opportunities for highly efficient, environmentally friendly cooling devices based on ferroic materials.
机译：铁磁中的电热效应被认为是一种强大的固态冷却技术。它的电势通过与反电热效应相关而增强，并导致在施加电场下降低或增加偶极熵的机制。然而，导致偶极熵随施加电场增加的机理尚不清楚，也存在争议。本研究研究了临界电场低的反铁电Pb_（0.99）Nb_（0.02）[（Zr_（0.58）Sn_（0.43））_（0.92）Ti_（0.08）] _（0.98）O_3的电热响应足以在较宽的温度范围内感应铁电相。利用依赖于温度和电场的介电测量，直接电热测量以及原位透射电子显微镜，证明了从常规电热响应到逆电热响应的转换。通过研究反铁电和铁电相之间的场致相变，可以使反电热效应的起源合理化。场致跃迁中潜热的消失与电热效应的交叉相吻合，并表明总体电热响应是不同熵贡献的相互作用。这为基于铁质材料的高效，环保的冷却设备打开了新的机遇。

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  • 来源
    《Physical review》 |2018年第9期|094113.1-094113.6|共6页
  • 作者

    Nikola Novak; Florian Weyland; Satyanarayan Patel; Hanzheng Guo; Xiaoli Tan; Juergen Roedel; Jurij Koruza;

  • 作者单位

    Institute of Materials Science, Technische Universitaet Darmstaaet, Alarich-Weiss-Straβe 2, 64287 Darmstadt, Germany,Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia;

    Institute of Materials Science, Technische Universitaet Darmstaaet, Alarich-Weiss-Straβe 2, 64287 Darmstadt, Germany;

    Institute of Materials Science, Technische Universitaet Darmstaaet, Alarich-Weiss-Straβe 2, 64287 Darmstadt, Germany;

    Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA;

    Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA;

    Institute of Materials Science, Technische Universitaet Darmstaaet, Alarich-Weiss-Straβe 2, 64287 Darmstadt, Germany;

    Institute of Materials Science, Technische Universitaet Darmstaaet, Alarich-Weiss-Straβe 2, 64287 Darmstadt, Germany;

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