Co掺杂SnO_2纳米粉的微结构和磁学性质  

Microstructure and Magnetic Properties of Cobalt-Doped SnO_2 Nano-Powders

作　　者：刘春明[1] 方丽梅[1] 祖小涛[1] W.L．Zhou 

机构地区：[1]电子科技大学物理电子学院,成都610054 [2]Advanced Materials Research Institute, Univ. of New Orleans, New Orleans LA 70148

出　　处：《电子科技大学学报》2006年第3期409-411,432,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金资助项目(10376006);新世纪优秀人才支持计划资助项目;四川省青年科学基金资助项目(03ZQ026-059)

摘　　要：采用湿化学方法制备了Co掺杂的二氧化锡纳米粉(Sn1-xCoxO2),经研究发现,Co以离子形式存在,而不是以单质形式存在,样品中除了金红石型的SnO2相之外,没有发现其他杂质的相,随着Co掺杂含量的增加,晶粒尺寸减小,光吸收谱红移,禁带宽度线性下降。钴离子磁矩随掺杂含量的增加而减小,这可能是由于占据晶格上近邻阳离子位置的磁性离子数目增加使磁性离子成反铁磁性排列的结果。Cobalt-doped SnO2 nano-powders （Sn1-xCoxO2） are fabricated by wet chemical method. It is found that cobalt exists as an ionic state instead of pure metal state. There is no other impurity phase in the samples except for rutile type SnO2. With the increase of cobalt concentration, the crystalline size decreases, the optical absorption spectra red-shiftes, and the band gap decreases linearly. The decrease of magnetic moment per cobalt atom with the increase of cobalt concentration could be attributed to the increased number of cobalt atoms occupying adjacent cation lattice positions that result in antiferromagnetic alignment.

关 键 词：SNO2 微结构 磁学性质 光吸收谱 

分 类 号：TB383[一般工业技术—材料科学与工程] O472.5[理学—半导体物理]