Co掺杂CaO材料的铁磁性研究  

Ferromagnetism in Co-Doped CaO Nanopowder

作　　者：赵婧[1] 李晋闽[1] 夏庆林[2] 

机构地区：[1]中国科学院半导体研究所半导体照明研发中心,北京100083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《西安交通大学学报》2011年第11期112-115,共4页Journal of Xi'an Jiaotong University

基　　金：国家高技术研究发展计划资助项目(2006AA03A122)

摘　　要：利用固态反应法制备了具有铁磁性的Co掺杂CaO纳米粉末材料,并对材料的结构和磁学性质进行了研究.X射线衍射和高分辨率透射电镜测试结果表明,材料为单相的CaO立方结构,Co掺杂导致了晶格常数的减小,表明Co离子通过替位Ca离子融入了CaO晶格.磁性分析表明,该Co掺杂CaO纳米粉末表现出了明显的铁磁特性,临界温度高于70K.通过分析认为,材料的铁磁性是由浅施主缺陷O空位与Co离子耦合形成束缚磁极化子引起的.The Co-doped CaO nanopowder was prepared by solid-state synthesis method.The structural and magnetic properties were investigated.X-ray diffraction and high resolution transmission electron microscopy studies show single-phase cubic CaO and distinct contraction of the lattice with Co doping,indicating an actual incorporation of Co ions into the CaO lattice.The magnetic studies show that the Co-doped CaO nanopowder displays a clear ferromagnetism behavior with the critical temperature higher than 70 K.The analysis suggests that the ferromagnetism is induced by the bound magnetic polarons due to O vacancies and Co ions coupling.

关 键 词：稀磁材料 纳米粒子 铁磁性 固相反应法 

分 类 号：TB34[一般工业技术—材料科学与工程]