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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Synergistically optimizing electrocaloric effects and temperature span in KNN-based ceramics utilizing a relaxor multiphase boundary
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Synergistically optimizing electrocaloric effects and temperature span in KNN-based ceramics utilizing a relaxor multiphase boundary

机译：利用弛豫多相边界协同优化KNN基陶瓷中的电热效应和温度跨度

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摘要

A combination of large adiabatic temperature change (Delta T) and wide temperature span (T-span) in lead-free ceramics is highly desired to develop eco-friendly and highly efficient solid-state refrigeration based on electrocaloric effects. However, the lack of success in synergistically optimizing both large Delta T and wide T-span in one material impedes the practical applications of electrocaloric refrigeration technology. Here, a relaxor multiphase boundary (RMPB) is structured in (1 - x)(K0.49Na0.49Li0.02)(Nb0.8Ta0.2)O-3-xCaZrO(3) (KNLNT-xCZ) ceramics through intentional composition engineering, successfully achieving a region of multiphase coexistence accompanied by diffuse phase transition. A moderate Delta T (0.63 K under 80 kV cm(-1)) with a wide T-span (43 K within 90% Delta T attenuation) is obtained in a relaxor KNLNT-5CZ ceramic with the coexistence of an R-O-T phase. The results indicate that a coupling effect originally from multi-directional polarization and polar nano-regions (PNRs) in RMPB contributes to the excellent performance combining large Delta T and wide T-span. This work not only expands the applications of KNN-based ceramics from electric energy storage and piezoelectric applications to the refrigeration field, but also opens up a new design avenue for the development of high performance electrocaloric materials with broad temperature ranges.
机译：强烈希望在无铅陶瓷中进行大的绝热温度变化（Delta T）和宽温度跨度（T-Span）的组合，以产生基于电热效应的环保和高效的固态制冷。然而，在一种材料中协同优化大型ΔT和宽T跨度在一种材料中缺乏成功阻碍了电热制冷技术的实际应用。这里，通过故意组成工程，成功实现了多相共存区域，伴随着漫反相转换。在具有R-O-T相的缓存的KNLNT-5CZ陶瓷中，获得具有宽T跨度（40％ΔT衰减内的80kVcm（-1）的温和δT（0.63k）），其具有R-O-T相的共存。结果表明，来自RMPB中的多向极化和极性纳米区域（PNR）最初的耦合效果有助于组合大ΔT和宽T跨度的优异性能。这项工作不仅将KNN的陶瓷从电能存储和压电应用扩展到制冷领域，而且还为具有宽温度范围的高性能电热材料开发开辟了新的设计途径。

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