Direct and indirect electrocaloric measurements using multilayer capacitors

Direct measurement of giant electrocaloric effect in BaTiO3 multilayer thick film structure beyond theoretical prediction

The electrocaloric effect of BaTiO3 multilayer thick film structure was investigated by direct measurement and theoretical calculation. The samples were prepared by the tape-casting method, which had 180 dielectric layers with an average thickness of 1.4μm. The thermodynamic calculation based on the polarization- temperature curves predicted a peak heat adsorption of 0.32J/g at 80^\circC under 176kV/cm electric field. The direct measurement via differential scanning calorimeter showed a much higher electrocaloric effect of 0.91J/g at 80^\circC under same electric field. The difference could re…

Kinetic electrocaloric effect and giant net cooling of lead-free ferroelectric refrigerants

Giant electrocaloric (EC) effect is observed in BaTiO3 multilayer thick film structure. The temperature change is as high as 4.0 oC under an applied electric field of 352 kV/cm. Most importantly, the EC effect is found to depend on the varying rate of the applied field. Based on the giant net cooling (~0.37 J/g) resulting from the difference in the varying rates of rising and falling fields, the kinetic EC effect provides an effective solution for the design of refrigeration cycle in ferroelectric micro-refrigerator.

不可翻转畴与内偏置在电热效应和热释电效应中的作用

Roles of Non-switchable Domains and Internal Bias in Electrocaloric and Pyroelectric effects

本研究通过直接磁滞测量揭示Pb(Zr0.65Ti0.35)O3薄膜中缺陷钉扎的不可翻转畴导致热释电与电热响应不对称，并提出极化调控和缺陷工程优化策略。

铁电纳米线阵列的域形态、电热响应及负电容状态

Domain Morphology, Electrocaloric Response, and Negative Capacitance States of Ferroelectric Nanowires Array

研究铁电纳米线阵列中域形态、电热响应及负电容状态的稳定性与增强机制。

用于高温储能电容器的BCZT/LSMO/BCZT多层薄膜

BCZT/LSMO/BCZT multilayer films for high temperature energy storage capacitors

本文制备了BCZT/LSMO/BCZT三明治薄膜，其在-50°C至300°C宽温域内介电性能稳定，储能密度达11.8 J/cm3且效率为77%，为高温储能电容器提供了有前景的候选材料。

接近$any$临界终点的巨大热效应

Giant caloric effects close to $any$ critical end point

基于熵论证提出利用电Grüneisen参数量化ECE的新框架，预测任意临界终点附近的巨大热效应，并解释室温氧化物多层电容器中的大ECE。