Al_2O_3掺杂CaCu_3Ti_4O_(12)陶瓷的介电性能与I-U非线性特征  

Dielectric properties and current-voltage nonlinear behavior of Al_2O_3-doped CaCu_3Ti_4O_(12) ceramics

作　　者：王亚娟[1] 曹蕾[1] 荆慧霞[1] 杨敬娜[1] 张瑜[1] 吴怡[1] 刘鹏[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2011年第4期34-38,共5页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50872078;50772065)

摘　　要：采用固相反应法,制备了一系列(1-x)CaCu3Ti4O12-xAl2O3(x=0,0.15,0.30,0.40)复相陶瓷.结果表明:Al2O3掺杂使CaCu3Ti4O12基陶瓷在降低低频范围内的介电损耗之外,同时使压敏电压大幅度的提高.当Al2O3的含量为0.30时的样品具有良好的综合电学性能:rε=2 000,tanδ=0.04(1 kHz),压敏电压Eb=1 084 V/mm且非线性系数α=4.6.The CaCu3Ti4O12 ceramics doped with various Al2O3（0,0.15,0.30 and 0.40） contents were fabricated by a solid-state reaction method.The results showed that, Al2O3 additive has not only reduced the dielectric loss of low frequency range but also significantly raised the breakdown voltage.When Al2O3 doping concentration x was 0.30,the specimen has achieved the best comprehensive electrical properties,including a dielectric constant（εr） of 2 000,dielectric loss（tan δ） of 0.04,breakdown voltage （Eb） of 1 084 V/mm,and a nonlinear coefficient of 4.6.

关 键 词：压敏电压 I-U非线性特征 巨介电常数 

分 类 号：O469[理学—凝聚态物理] TB333[理学—电子物理学]