流变相反应法合成Zn_(1-x)Co_xO室温稀磁半导体  

Room-temperature ferromagnetism in Zn_(1-x)Co_xO DMSs prepared by rheological phase reaction method

作　　者：王勇[1] 曾振欧[1] 冯春华[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510641

出　　处：《功能材料》2010年第2期285-287,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20803025)

摘　　要：利用流变相反应法制备得到Zn1-xCoxO(x=0.02、0.04、0.06、0.08)稀磁半导体材料。X射线衍射分析,发现Co的掺杂并未改变ZnO的纤锌矿结构,并没有杂质相的生成,衍射峰的峰位随着Co掺杂向高角度移动,Co已进入ZnO晶格。电镜及吸收光谱进一步表明样品中没有第二相的出现,Co2+成功掺入ZnO晶格。采用超导量子干涉磁强仪测量Zn0.96Co0.04O的磁性,样品在300K存在明显的磁饱和现象和磁滞回线,表明具有室温下铁磁性,其磁性来源可以用束缚磁极化子(BMPs)模型解释。Zn1-xCoxO（x=0.02,0.04,0.06,0.08） diluted magnetic semiconductors were synthesized by rheological phase reaction-precursor method.No secondary phase was observed with the sensitivity of XRD measurement.Electron microscope photos and absorption spectra results indicated that Co^2＋ successfully incorporated into the wurtzite lattice at the Zn2＋ sites.The measurement of magnetism was carried out by using a superconducting quantum interference device（SQUID）,it reveals that the Zn0.96Co0.04O powder clearly exhibit room-temperature ferromagnetic behavior.The mechanism of this phenomenon is discussed with the BMPs theory.

关 键 词：稀磁半导体:Co掺杂ZnO 流变相反应 铁磁性 

分 类 号：TB331[一般工业技术—材料科学与工程]