用于表征钽铌酸铅多层陶瓷电容器电热材料效率的直接热方法

Direct Thermal Method to Characterize the Material Efficiency of Electrocaloric Lead Scandium Tantalate Multilayer Ceramic Capacitors.

作者信息

Unmüßig Sabrina, Bach David, Metzdorf Julius, Corhan Patrick, Hirose Sakyo, Bartholomé Kilian

机构信息

Fraunhofer Institute for Physical Measurement Techniques IPM, Georges-Köhler-Allee 301, 79110 Freiburg, Germany.

Murata Manufacturing Co., Ltd., Kyoto 617-0833, Japan.

出版信息

Materials (Basel). 2025 Apr 24;18(9):1924. doi: 10.3390/ma18091924.

DOI:10.3390/ma18091924

PMID:40363428

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12072923/

Abstract

In this study, we characterize electrocaloric lead scandium tantalate (PST) samples by means of the adiabatic temperature change ΔTad and the dissipative heat qdiss with a direct thermal method. The figure of merit (FOM), defined as the ratio between the adiabatic temperature change and the thermal hysteresis, quantifies the losses of the material. Additionally, it is also possible to draw conclusions on the efficiency of a caloric cooling system based on the regenerator or cascaded approach. The maximum adiabatic temperature change of the measured samples results in ΔTad,max=(1.39±0.02) K and the dissipative heat yields qdiss=(0.39±0.05) J/(kg K), resulting in an FOM=(5.1±0.2). The efficiency for an ideal cascaded system is given by ηcas=0.56, and for the ideal regenerator, the efficiency is given by ηreg=0.84. The results demonstrate that the PST material in this study exceeds the maximum FOM in the literature by 34%.

摘要

在本研究中，我们采用直接热学法通过绝热温度变化ΔTad和耗散热qdiss对电热钽酸铅钪（PST）样品进行了表征。品质因数（FOM）定义为绝热温度变化与热滞之比，用于量化材料的损耗。此外，还可以基于回热器或级联方法对热冷却系统的效率得出结论。所测样品的最大绝热温度变化为ΔTad,max =(1.39±0.02)K，耗散热为qdiss =(0.39±0.05)J/(kg K)，品质因数为FOM=(5.1±0.2)。理想级联系统的效率为ηcas = 0.56，理想回热器的效率为ηreg = 0.84。结果表明，本研究中的PST材料的品质因数比文献中的最大值高出34%。