MoO_3掺杂Ba_(0.98)Bi_(0.02)(Ti_(0.9)Zr_(0.1))O_3陶瓷的介电性能研究  

Study on dielectric properties of Ba_(0.98)Bi_(0.02)(Ti_(0.9)Zr_(0.1))O_3 ceramics doped with MoO_3

作　　者：王久石[1] 丁士华[1] 宋天秀[1] 那文菊[1] 王岩[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《电子元件与材料》2011年第3期4-7,11,共5页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(No.11074203);西华大学人才基金资助项目(No.R0620109);西华大学研究生创新基金资助项目(No.YCJJ200924)

摘　　要：采用固相反应法制备了Ba0.98Bi0.02(Ti0.9Zr0.1)1-xMoxO3(x=0,0.01,0.03,0.05)陶瓷,研究了MoO3掺杂对Ba0.98Bi0.02(Ti0.9Zr0.1)O3陶瓷的相结构、表面形貌和介电性能的影响。X射线衍射分析表明所有样品均是四方晶体结构,x=0.03时Mo6+能够完全溶入Ba0.98Bi0.02(Ti0.9Zr0.1)O3陶瓷晶格中。所有陶瓷样品均表现出弛豫铁电体的特征。掺杂MoO3后,陶瓷晶粒尺寸减小,介电常数提高,介质损耗、剩余极化强度、矫顽场强均减小。当x=0.01时,陶瓷介电性能最佳:εmax=7129(10 kHz),tanδ=0.011 6。Ba0.98Bi0.02（Ti0.9Zr0.1）1-xMoxO3（x=0, 0.01, 0.03, 0.05） ceramics were prepared by the solid phase synthesis method. The effects of the doping of Mo^6＋ on the phase structure, the surface morphology and the dielectric properties of Ba0.98Bi0.02（Ti0.9Zr0.1）O3 ceramic were studied. X-ray diffraction analysis indicates that all of the ceramic samples possess tetragonal crystal structure, and Mo^6＋ can be fully incorporated into the perovskite lattice of Ba0.98Bi0.02（Ti0.9Zr0.1）O3 ceramic at x=0.03. The permittivity as a function of temperature at different frequencies show that all of the ceramics samples have characteristics of relaxor ferroelectric. The results reveal that after Mo^6＋ doping, grain sizes are decreased, permittivity are increased, dielectric loss, remnant polarization and coercive field are all decreased.When x=0.01, prepared ceramics have the best properties： εmax=7129（10kHz）,tanδ=0.0116.

关 键 词：铁电体 Ba0.98Bi0.02(Ti0.9Zr0.1)O3陶瓷 介电弛豫 偶极子 

分 类 号：TM22[一般工业技术—材料科学与工程]