摘要
用激光气相热解法制备了α－Ｆｅ（ｂｃｃ）和γ－Ｆｅ（ｆｃｃ）纳米微粒利用高分辨透射电子显微镜、Ｘ射线衍射和磁测量研究了纳米微粒表面氧化物的结构、形貌及磁性能结果表明，纳米铁微粒表面的氧化铁厚度约５ｎｍ；由细小微晶（２－５ｎｍ）组成．该氧化铁层呈非铁磁或超顺磁性．室温下微粒表面形成的氧化铁为ＦｅＯ４，而非Ｆｅ３Ｏ４和α－Ｆｅ２Ｏ３的混合物。
alpha -Fe (bcc) and gamma -Fe (fcc) nanoparticles have been prepared by laser-induced pyrolysis. The structures, morphologies and magnetic properties of the oxide layers covering the iron nanoparticles have been investigated using transmission electron microscopy, magnetic measurement, X-ray diffraction and annealing treatment. It is shown that the iron oxide layers consist of very fine crystallites of 2-5 nm in diameter, and the layers are non-ferromagnetic or superparamagnetic. The iron oxide layer formed on iron nanoparticles at room temperature is Fe3O4, rather than a mixture of Fe3O4 and gamma -Fe2O3.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期633-636,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目58971019
关键词
纳米微粒
氧化铁
磁性能
结构
gamma-Fe
alpha-Fe
nanoparticle
iron oxide
magnetic property
