树叶状Co和Co_3O_4的水热合成与磁性研究  

Synthesis and magnetic property of Co and Co_3O_4 with leaf like morphology

作　　者：吴明在[1,2] 赵修彬[1] 庞占文[1] 王培养[1] 戴鹏[1] 马永青[2] 

机构地区：[1]安徽大学教育部光电信息获取与控制重点实验室,安徽合肥230039 [2]安徽大学安徽省磁性材料工程技术研究中心,安徽合肥230039

出　　处：《武汉科技大学学报》2012年第1期25-28,共4页Journal of Wuhan University of Science and Technology

基　　金：安徽省自然科学基金资助项目(11040606M49);安徽省高校自然科学资金资助项目(KJ2010A012);安徽省高校优秀青年人才基金资助项目(2009SQRZ022ZD);安徽大学研究生创新资助项目(yqh090010)

摘　　要：以氯化钴(CoCl2.6H2O)和氢氧化钠作为反应前驱物,采用水热法合成微米级树叶状钴单质,在500℃退火条件下得到形貌相似的Co3O4粒子,并运用XRD、SEM和VSM对所得粒子的结构、形貌和磁性能进行了初步研究。结果表明,树叶状钴单质表现出室温铁磁行为,具有较高的磁参数,其中饱和磁化强度为139.3emu/g、矫顽力为29.5kA/m。同时发现,在500℃×1h退火后的Co3O4还出现极弱的铁磁性行为,可能是未完全氧化的Co单质所产生。Leaf like Co microcrystals were prepared via a hydrothermal reduction reaction using COCl2 · 6H20 as starting materials. After being annealed at 500℃ for lh, leaf-like Co microcrystals were transformed into Co3O4 with the morphology unchanged. X ray diffractometer （XRD）, transmission electron microscope （TEM）, and vibrating sample magnetometry （VSM） measurements were carried out to investigate their structures, morphologies and magnetic properties. Based on the measurement results, it was found that the fractal leaf-like Co exhibited ferromagnetic behavior with a saturation magnetization of 139.3 emu/g and a coercivity of 29.5 kA/m at room temperature, while Co3O4 exhibited a weak ferromagnetic characteristic, which was possibly due to the unreacted metal Co.

关 键 词：水热合成 微观结构 树叶状Co3O4 Co磁性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]