脉冲电容器用细电滞回线铁电陶瓷材料的研究  

Study on slim-loop ferroelectric ceramics for high-power pulse capacitors

作　　者：陈学锋[1] 李华梅[2] 李东杰[2] 曹菲[1] 董显林[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]中国工程物理研究院,绵阳621900

出　　处：《物理学报》2008年第11期7298-7304,共7页Acta Physica Sinica

摘　　要：采用低锆区的Pb(Zr0.42Sn0.40Ti0.18)O3(PZST42/40/18)铁电陶瓷为基,通过少量La和Ba取代Pb同时Nb取代(Zr,Sn,Ti)复合取代的方法得到掺杂PZST42/40/18细电滞回线铁电陶瓷,其最大极化强度Pmax≈20.66μC/cm2,剩余极化强度Pr≈0.55μC/cm2,电滞回线包含面积S≈0.0298 J/cm3,室温下相对介电常数虽然只有2840,但储能密度却达0.319 J/cm3.反复充放电脉冲试验初步显示:单片掺杂PZST42/40/18铁电陶瓷样品的短路放电电流可达2330A,反复充放电次数在1000次以上;释放的电荷随着充放电次数的增加按照二次指数公式衰减.这对掺杂PZST42/40/18细电滞回线铁电陶瓷用作脉冲电容器具有重要意义.A slim-loop ferroelectric ceramic of Pb （Zr0.42Sn0.40Ti0.18 ）O3 （PZST42/40/18） was prepared by partially replacing Pb with Ba and La, and replacing （Zr, Sn, Ti） with Nb in low zireoniumn. The saturation polarization （Ps）, the remnant polarization （Pt） and the area of the hysteresis loop （S） were measured to be 20.66 μC/cm^2, 0.55 μC/cm^2 and 0.0298 J/cm^3, respectively. Relative permittivity （ ε ） ≈ 2840 can be reached in this ferroelectrie ceramic at room temperature and frequency of 1 kHz, but the energy density （w） is 0. 319 J/cm^3. The results of the pulse charge-discharge measurements showed that a single piece of the PZST42/40/18 slim-loop ferroelectric ceramic can carry 2330 A and endures charge-discharge cycle over one thousand times. The released charge decreases with increasing cycle times according to second order exponential decay. These ferroelectric ceramics have potential for pulsed power capacitor applications.

关 键 词：细电滞回线 铁电陶瓷 PZST 脉冲电容器 

分 类 号：TM221[一般工业技术—材料科学与工程] TM28[电气工程—电工理论与新技术]