La掺杂BiFe_(0.5)Co_(0.5)O_3陶瓷的结构和性能  

Structure,electrical and magnetic behavior of La_xBi_(1-x)Fe_(0.5)Co_(0.5)O_3(x=0.00～0.30) multiferroic ceramics

作　　者：吴静[1] 李信民[1] 毛翔宇[1] 陈小兵[1] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002

出　　处：《扬州大学学报（自然科学版）》2010年第2期20-23,共4页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(10274066);江苏省自然科学基金资助项目(BK2005052)

摘　　要：采用固相烧结工艺制备了LaxBi1-xFe0.5Co0.5O3(BLFCO-x,x=0.00,0.05,0.15,0.30)陶瓷样品,研究了La掺杂对BiFe0.5Co0.5O3陶瓷结构、漏电流、磁性能以及介电性能的影响.X射线衍射测试结果显示,BLFCO-x样品基本形成了BFCO的相,但随着La的掺杂,晶格常数发生改变,结构向四方相转变.少量La离子的掺入降低了BFCO的漏电流.在常温下,随着La离子浓度的增大,BLFCO-x样品的磁性逐渐下降.样品的变温介电结果表明,当La离子浓度较小时,存在两个介电峰,但La离子浓度较大时,呈现单一介电峰.LaxBi1-xFe0.5Co0.5O3（x=0.00,0.05,0.15,0.30） multiferroic ceramic samples were prepared by a traditional solid-state reaction method.The effects of La doping on the microstructure,leakage current,magnetic properties and dielectric properties were investigated.X-ray diffraction shows that samples are of the typical phase of BiFe0.5Co0.5O3,but with La-substitut,the lattice parameters are changed and the structure changes into tetragonal phase.According to the ferroelectric measurement results,the doping of La（x=0.05） can effectively reduce the leakage current density of BLFCO-x ceramics.At room temperature,with the increase of La concentration,the magnetic properties of BLFCO-x samples gradually decrease.When the content of La in samples is small it shows two dielectric peaks in the ε-t curves,while the content is large it shows a single dielectric peak.

关 键 词：多铁陶瓷 LA掺杂 剩余磁化 介电常数 

分 类 号：O482.54[一般工业技术—材料科学与工程]