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Enhanced electrocaloric effect in compositional driven potassium sodium niobate-based relaxor ferroelectrics

机译:增强了组成驱动钾铌酸钠的稀释剂铁钠铁电气的电热效应

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摘要

Lead-free ferroelectric electrocaloric ceramics that could convert electrical energy into heat are the promising candidate for environment-friendly cooling devices. For refrigeration devices, a large temperature change (△T) and good temperature stability are required, which are highly related to the phase structure and the applied electric field. In this work, a diffused ferroelectric-paraelectric (FP) phase transition is formed in (K, Na)NbO3 (KNN) by using appropriate composition engineering. The relaxor ferroelectrics in this work present both a large △f of 1.24 K and a high △T/△E of 0.19 K mm/kV. In addition, a wide temperature span exceeds 55 °C at the high electrocaloric effect (ECE) criterion (△≥ 0.5 K) could also be observed. This work not only opens a new strategy for obtaining high-performance ceramics for refrigeration devices but also extends the application area of the KNN-based lead-free ferroelectrics from sensors, actuators and energy harvesting to solid-state cooling applications.
机译:可以将电能转化为热量的无铅铁电电热陶瓷是适用于环保冷却装置的有希望的候选者。对于制冷装置,需要大的温度变化(△T)和良好的温度稳定性,这与相位结构和施加的电场高度相关。在这项工作中,通过使用适当的组成工程,在(k,Na)NbO 3(Knn)中形成扩散铁电酶(FP)相转变。在这项工作中的松弛剂铁电器既是1.24 k的大△F均为0.19kmm / kV的高于1.24 k和高△T/△e。此外,宽的温度跨度在高电热量效果(ECE)标准(ECE)标准(≥0.5k)也可以被观察到。这项工作不仅开辟了获得制冷装置的高性能陶瓷的新策略,还将来自传感器,致动器和能量收集的基于KNN的无铅铁电气的应用面积扩展到固态冷却应用。

著录项

  • 来源
    《Journal of Materials Research》 |2021年第5期|1142-1152|共11页
  • 作者单位

    Department of Materials Science Sichuan University Chengdu 610065 China;

    Department of Materials Science Sichuan University Chengdu 610065 China;

    Department of Materials Science Sichuan University Chengdu 610065 China;

    Department of Materials Science Sichuan University Chengdu 610065 China;

    Department of Materials Science Sichuan University Chengdu 610065 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);
  • 原文格式 PDF
  • 正文语种 eng
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