摘要
提出了两次反应制备γ-Fe2O3纳米微粒的新方法.制备过程中通过控制第2次反应中NaOH的浓度实现了由结晶的FeOOH逐渐转化为结晶的γ-Fe2O3纳米微粒.用X射线衍射仪(XRD)、透射电子显微镜(TEM)和振动样品磁强计(VSM)分别对纳米微粒的晶体结构、形态和大小、磁化强度进行表征.实验结果表明,γ-Fe2O3纳米微粒具有高结晶性,形状近似为球形,饱和磁化强度达63.90A.m2/kg,是γ-Fe2O3块体饱和磁化强度的84.1%.
A novel method for preparing γ-Fe2O3 nanoparticles by a two-step procedure is proposed.In the experiment,phase transformation from highly crystallized FeOOH to γ-Fe2O3 nanoparticles was achieved by controlling the concentration of NaOH in the second reaction.The crystalline structure,morphology and magnetic properties of the as-synthesized nanocrystallites were characterized by X-ray powder diffraction（XRD）,transmission electron microscope（TEM）and vibrating sample magnetometer（VSM）,respectively.From these measurements we concluded that the γ-Fe2O3 nanoparticles prepared had high crystallization and the particles were nearly spherical,the saturation magnetization was 63.90 A·m2/kg,which was 84.1% of the value for γ-Fe2O3 bulk.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期46-50,共5页
Journal of Southwest University(Natural Science Edition)
基金
重庆市自然科学基金资助课题(CSTC
2007BA3031)
