测量条件对改性钛酸钡铁电陶瓷电热效应的影响。

The Influence of Measurement Conditions on the Electrocaloric Effect in Ferroelectric Ceramics of Modified Barium Titanate.

作者信息

Krupska-Klimczak Magdalena, Ziewiec Krzysztof, Jankowska-Sumara Irena

机构信息

Institute of Security Studies and Computer Science, University of the National Education Commission, Podchorążych 2, 30-084 Kraków, Poland.

Department of Exact and Natural Sciences, University of the National Education Commission, Podchorążych 2, 30-084 Kraków, Poland.

出版信息

Materials (Basel). 2024 Jul 5;17(13):3329. doi: 10.3390/ma17133329.

DOI:10.3390/ma17133329

PMID:38998408

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11243295/

Abstract

In this work, the electrocaloric effect (ECE) and electrocaloric strength (Δ/) were measured and thermal and dielectric studies were performed on Pb-modified BaTiO (BPT). The saturated hysteresis loops and normal ferroelectric behavior of the ferroelectric ceramics allow the utilization of the indirect method to estimate the electrocaloric properties. The electrocaloric measurements were performed under high (18 kV/cm) versus low (8 kV/cm) electric field conditions. These conditions were chosen to notice and then eliminate an artificial negative electrocaloric effect in the tested ceramics. At the same time, relatively high values of positive electrocaloric temperature change Δ (~ 2.19 K) and electrocaloric strength Δ/ (~0.27-0.11 K·cm/kV) were obtained.

摘要

在本研究中，对铅改性钛酸钡（BPT）进行了电热效应（ECE）和电热强度（Δ/）的测量，并开展了热学和介电研究。铁电陶瓷的饱和磁滞回线和正常铁电行为使得可以采用间接方法来估算电热性能。电热测量是在高电场（18 kV/cm）与低电场（8 kV/cm）条件下进行的。选择这些条件是为了发现并消除测试陶瓷中人为产生的负电热效应。同时，获得了相对较高的正电热温度变化Δ（约2.19 K）和电热强度Δ/（约0.27 - 0.11 K·cm/kV）。