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首页> 外文期刊>Journal of Applied Physics >Relation between dielectric permittivity and electrocaloric effect under high electric fields in the Pb(Mg_(1/3)Nb_(2/3))O_3-based ceramics
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Relation between dielectric permittivity and electrocaloric effect under high electric fields in the Pb(Mg_(1/3)Nb_(2/3))O_3-based ceramics

机译：Pb中高电场介电常数与电热效应的关系（Mg_（1/3）Nb_（2/3））O_3陶瓷

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摘要

The correlation between dielectric permittivity and electrocaloric (EC) temperature change (△T_(EC)) has been investigated in (1 -x)Pb(Mg_(1/3)Nb_(2/3))O_3-xPbTiO_3 (PMN-100xPT, with x = 0, 0.05, and 0.10) relaxor ferroelectric ceramics. At a given electric field, both peak temperatures, including the temperature of the permittivity peak (T_m) and the temperature of the maximum of the △T_(EC) (T_(EC max)) increase with increasing PT content. The peak of the dielectric permittivity is, regardless of the applied electric field, always at a higher temperature than is the T_(EC max), and the temperature gap between both maxima progressively increases with increasing applied DC bias. This is particularly true above the threshold field, which induces the long-range ordered ferroelectric state. The results, which are explained in terms of the electric field-temperature phase diagram of relaxor systems, thus reveal that T_m can only roughly mark the temperature of the upper boundary of the temperature-electric field window, where the EC responsivity (△T_(EC)/△E) is the highest.
机译：介电介电常数和电热量（EC）温度变化（△T_（EC））（1 -X）PB（MG_（1/3）NB_（2/3））O_3-XPBTIO_3（PMN-100xpt ，x = 0,0.05和0.10）松弛式铁电陶瓷。在给定的电场，峰值温度，包括介电常数峰值（T_M）的温度和△T_（EC）的最大温度（T_（EC）（T_（EC MAX））随着Pt含量的增加而增加。无论施加的电场如何，介电介电常数的峰值始终在比T_（EC MAX）更高的温度下，并且两个最大值之间的温度间隙随着施加的DC偏置的增加而逐渐增加。这在阈值场之上尤其如此，它诱导远程有序铁电状态。结果，其在松弛剂系统的电场温度相图中解释，因此揭示了T_M只能粗略地标记温度 - 电场窗口的上边界的温度，其中EC响应值（△T_（ EC）/△e）是最高的。

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  • 来源
    《Journal of Applied Physics》 |2020年第18期|184102.1-184102.7|共7页
  • 作者

    Lovro Fulanovic; Andraz Bradesko; Nikola Novak; Barbara Malic; Vid Bobnar;

  • 作者单位

    Jozef Stefan Institute Jamova Cesta 39 SI-1000 Ljubljana Slovenia Institute of Materials Science Technische Universitaet Darmstadt Alarich-Weiss-Strasse 2 64287 Darmstadt Germany;

    Jozef Stefan Institute Jamova Cesta 39 SI-1000 Ljubljana Slovenia Jozef Stefan International Postgraduate School Jamova Cesta 39 SI-1000 Ljubljana Slovenia;

    Jozef Stefan Institute Jamova Cesta 39 SI-1000 Ljubljana Slovenia;

    Jozef Stefan Institute Jamova Cesta 39 SI-1000 Ljubljana Slovenia Jozef Stefan International Postgraduate School Jamova Cesta 39 SI-1000 Ljubljana Slovenia;

    Jozef Stefan Institute Jamova Cesta 39 SI-1000 Ljubljana Slovenia Jozef Stefan International Postgraduate School Jamova Cesta 39 SI-1000 Ljubljana Slovenia;

  • 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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