Hf^(4+)离子掺杂BNT对电卡性能的影响  

Effect of Hf^(4+) Ion Doped BNT on the Performance of Electrocaloric Effect

作　　者：石雯静 黄韵瑶 魏晓勇[1] 靳立[1] SHI Wenjing;HUANG Yunyao;WEI Xiaoyong;JIN Li(Electronic Materials Research Laboratory,Key Laboratory of the Ministry of Education&International Center for Dielectric Research,School of Electronic Science and Engineering,Faculty of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电子陶瓷与器件教育部重点实验室,国际电介质研究中心,电子科学与工程学院电信学部,陕西西安710049

出　　处：《压电与声光》2022年第4期588-592,共5页Piezoelectrics & Acoustooptics

摘　　要：该文采用传统固相合成法制备了Bi_(0.5)Na_(0.5)Ti_((1-x))Hf_(x)O_(3)(x=0,0.02,0.04和0.06)陶瓷,通过X线衍射仪(XRD)和扫描电子显微镜(SEM)表征了其相结构、微观表面,并研究了其介电性能、铁电性能及比热容与相变的关系。通过构建电场和温度的条件,共同调控铁电相变。再借助麦克斯韦方程,通过间接法计算,最终在50℃、70 kV/cm的电场下,在Bi_(0.5)Na_(0.5)TiO_(3)-0.04Hf陶瓷中通过诱导畴变得到了0.5 K的负电卡效应。Bi_(0.5)Na_(0.5)Ti_((1-x))Hf_(x)O_(3)(x=0,0.02,0.04,0.06)ceramics were made using the conventional solid-state synthesis method in this study.By using XRD and SEM to characterize the phase structure and microsurface,the dielectric and ferroelectric characteristics,but also the connection between specific heat capacity and phase transition,were all investigated.In the study,we regulate the temperature and electric field to control the ferroelectric phase transition.The electrocaloric effect to be close to room temperature is excepted.Finally,the negative electrocaloric effect of ΔT=0.5 K was successfully attained in Bi_(0.5)Na_(0.5)TiO_(3)-0.04Hf ceramics by induced domain switching at 50℃ and 70 kV/cm electric field with the aid of Maxwell’s equation and the indirect method.

关 键 词：BNT基 电卡效应 无铅 钙钛矿 铁电陶瓷 

分 类 号：TN384[电子电信—物理电子学]