BiFe_(1-x)T_xO_3(T=Co和Ni)的晶体结构和磁性  

Magnetic properties and crystalline structure of BiFe_(1-x)TxO_3(T=Co and Ni)

作　　者：马禹[1,2] 张玉洁[1,3] 张红国[1] 阴津华[1,2] 张宏伟[1] 王凤平[2] 王文全[3] 吴光恒[1] 

机构地区：[1]中国科学院物理研究所磁学国家重点实验室,北京100190 [2]北京科技大学应用科学学院,北京100083 [3]吉林大学物理学院,长春130023

出　　处：《北京科技大学学报》2010年第8期1041-1044,1070,共5页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究计划资助项目(No.2009CB929501);北京市教育委员会学科和研究生教育计划专项基金资助项目

摘　　要：比较了运用固相烧结法制备的BiFe1-xCoxO3和BiFe1-xNixO3的晶体结构、饱和磁化强度和矫顽力随掺杂量的依赖关系.结果发现,强磁性的立方结构是掺杂样品磁性的主要来源.Ni掺杂样品的居里温度比Co掺杂样品高,这是由于原子间距和离子种类的不同造成了磁性离子间超交换作用的强弱变化所致.Co离子具有较强的单离子各向异性和偏离立方结构的晶格畸变,造成了Ni掺杂样品的矫顽力比Co掺杂样品低.变温磁滞回线的结果表明,BiCoO3样品的磁晶各向异性随温度降低而增大.The doping content dependence of crystalline structures, saturation magnetization and coercivities of BiFe1-xCoxO3 was compared with that of BiFe1-xNixO3. All the samples are fabricated by solid-state sintering. It is found that ferromagnetic cubic structure in doping samples is the main source of magnetic properties. The Curie temperatures of Ni-doped samples are higher than those of Co-doped samples. The difference in Curie temperature might be due to the variation of magnetic super-exchange coupling between magnetic cations which is caused by interatomie distance and the kinds of cations. Ni-doped samples have smaller eoereivities than Codoped samples. The large coercivity results from the lattice distortion and the strong single ion anisotropy of Co cations. The results of hysteresis loops of BiCoO3 at different temperatures show that the magnetocrystalline anisotropy of BiCoO3 samples increases with decreasing temperature.

关 键 词：多铁性材料 铁酸铋 磁性 晶体结构 

分 类 号：TM271[一般工业技术—材料科学与工程] TM22[电气工程—电工理论与新技术]