纳米铁微粒表面氧化物的结构及磁性  

STRUCTURE AND MAGNETIC PROPERTIES OF THE OXIDE LAERS FORMED ON IRON NANOPARTICLRS

作　　者：赵新清[1] 梁勇[2] 胡壮麒[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]中国科学院金属研究所,沈阳110016

出　　处：《金属学报》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

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.

关 键 词：纳米微粒 氧化铁 磁性能 结构 

分 类 号：TB383[一般工业技术—材料科学与工程] TG14[金属学及工艺—金属材料]