0.45(Bi_(1-x)La_x)FeO_3/0.55SrTiO_3复合体的制备和性能研究  

Study on preparation and properties of 0.45(Bi_(1-x)La_x)FeO_3/0.55SrTiO_3 composites

作　　者：吴晓波[1,2] 蔡炜[2] 王晓飞[2] 

机构地区：[1]南京医科大学基础医学院,江苏南京210029 [2]南京大学物理学院,江苏南京210093

出　　处：《苏州大学学报（自然科学版）》2010年第4期48-52,共5页Journal of Soochow University(Natural Science Edition)

基　　金：国家自然科学基金(50832002);973项目(2009CB929501);江苏省高校自然科学基金(09KJB310009)

摘　　要：采用传统的固相反应法制备了0.45(Bi1-xLax)FeO3/0.55SrTiO3(x=0.1,0.2)复合体陶瓷.复合体样品的X衍射谱结果显示没有产生杂相,为单一的钙钛矿结构.对复合体的电滞回线和磁滞回线的测量结果表明,样品在室温下有较好的铁电性与磁性.同时,随着La的掺杂比例的提高,样品的铁电性能和磁性能均有所提高.而介电测量表明样品中存在弛豫型的介电损耗峰,推测样品中的氧空位可能是引起介电弛豫的主要原因.The 0.45（Bi1-xLax）FeO3/0.55SrTiO3 composites with x=0.1 and 0.2 have been prepared by solid state reaction method.The X-ray diffraction（XRD） pattern shows that the 0.45（Bi1-xLax）FeO3/0.55SrTiO3 composites have the perovskite type structure and no impurity phases are observed.The composite exhibited ferroelectric as well as magnetic characteristics at room temperature.Meanwhile,the ferroelectric and magnetic enhancements were observed for 0.45（Bi1-xLax）FeO3/0.55SrTiO3 composites with La doping.The dielectric properties of the composite ceramics were also investigated.The possible origin for the relaxor behavior of 0.45（Bi1-xLax）FeO3/0.55SrTiO3 composites is considered to be oxygen vacancies.

关 键 词：0.45(Bi1-xLax)FeO3/0.55SrTiO3复合体 磁性 介电性能 

分 类 号：TM282[一般工业技术—材料科学与工程] TM284[电气工程—电工理论与新技术]