BaZr_(0.2)Ti_(0.8)O_3无铅厚膜陶瓷的电卡效应  

Electrocaloric Effect of BaZr_(0.2)Ti(0.8)O_3 Lead-free Thick Film Ceramic

作　　者：简晓东 路标[1] 李丹丹[1] 姚英邦 梁波[1] 陶涛[1] 鲁圣国[1] 

机构地区：[1]广东省功能软凝聚态物质重点实验室广东工业大学材料与能源学院,广州510006

出　　处：《硅酸盐学报》2017年第3期333-338,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51372042);国家自然科学基金–广东省联合基金(U1501246);广东省自然科学基金重大基础研究培育项目(2015A030308004);广东省教育厅重大基础研究培育项目(2014GKXM039)资助

摘　　要：通过流延法与常压空气气氛固相烧结工艺制备锆钛酸钡(Ba(Zr_(0.2)Ti_(0.8))O_3)无铅厚膜陶瓷,用X射线衍射仪、扫描电子显微镜、Agilent 4284A阻抗分析仪和RADIANT RT–66A铁电分析仪对其晶体结构、微观形貌、电学性能进行了表征,用Maxwell关系估算了材料的电卡效应,即等温熵变和绝热温变。结果表明:Ba(Zr_(0.2)Ti_(0.8))O_3厚膜陶瓷钙钛矿相纯且结构完整,微观结构致密;Ba(Zr_(0.2)Ti_(0.8))O_3厚膜陶瓷呈现弛豫型铁电体特征;材料具有良好的极化特性,耐击穿电压达20 MV/m。材料的绝热温变ΔT在电场20 MV/m及温度100℃时达1.2 K。Barium zirconate titanate （i.e., Ba（Zro.2Tio.8）O3） thick film ceramics were prepared by a tape-casting method. Their structures, morphologies, and electric properties were characterized using X-ray diffraction （XRD）, scanning electron microscopy （SEM）, impedance analysis and ferroelectric analysis, respectively. The electrocaloric effect, i.e., isothermal entropy changes and adiabatic temperature changes, was calculated by the Maxwell equations. According to the results by XRD and SEM, the thick film ceramics obtained are a pure and dense perovskite structure. The dielectric analyses indicates that the Ba（Zr0.2Ti0.8）O3 thick film ceramics show the characteristics of relax or ferroelectrics. The polarization--electric field （P-E） hysteresis loops reveal greater polarizations, and the ceramics can withstand an electric field of 20 MV/m. The adiabatic temperature change, AT, calculated according to the Maxwell equations and the polarization versus temperature extracted from the P-E hysteresis loops are approximately 1.2 K at 100℃ and 20 MV/m.

关 键 词：锆钛酸钡 厚膜陶瓷 电滞回线 电卡效应 

分 类 号：TQ174[化学工程—陶瓷工业]