BNKT-BZN无铅压电陶瓷的电学和储能性能

Energy-Storage and Electrical Properties of Lead-free BNKT-BZN Piezoelectric Ceramics

为发现新的兼具高储能性能的环境友好型介电陶瓷,使用传统固相法制备一系列(1-x)(Na_(0.82)K_(0.18))_(0.5)Bi_(0.5)TiO_(3)-xBi(Zn_(2/3)Nb_(1/3))O_(3)(BNKT-BZN)无铅铁电陶瓷,通过扫描电镜可以看到所有组分的微观结构均结晶良好且致密.X射线衍射和拉曼图谱可以看到随着铌锌酸铋含量的增大,陶瓷的晶相为混合相,主晶相逐渐由三方相结构转化为四方相.使得陶瓷的介电峰逐步宽化且渐渐降低.成分为0.94BNKT-0.06BZN的陶瓷拥有优良的储能性能和颀长的电滞回线,有效储能密度W_(rec)为0.80 J/cm^(3),总储能密度达到1.62 J/cm^(3),储能效率η为49.4%.

To detect a original environment-friendly dielectric ceramics with high energy conservation,a series of(1-x)(Na0.82K0.18)0.5Bi0.5TiO3-xBi(Zn2/3Nb1/3)O3(BNKT-BZN)lead-free ferroelectric ceramics were prepared by the conventional solid-state method.The SEM images showed that the samples were fine-grained with high-density microstructure.The test results of X-ray diffraction pattern and Raman spectroscopy showed that with the increase of BZN content,the phase structure was transferred from rhombohedral to tetragonalphase.It made the dielectric constant of ceramics decrease,and the dielectric peak was also constantly widened.0.94 BNKT-0.06 BZN ceramics had nice energy storage performance,the hysteresis presented a thin shape,the effective energy storage of ceramics was Wrec=0.80 J/cm^(3),while total energy storage was 1.62 J/cm^(3),and the energy storage efficiency reachedη=49.4%.