高温退火对浸渍包钴超微铁颗粒表面结构的影响

Annealing Effect on the Structure of Cobalt Soaked Layer of Ultrafine Feparticles

浸渍包钴的超微铁颗粒 ,经高温退火以后 ,X射线衍射谱表明 ,其表面及内核的结构有了明显的变化 ,这是由于高温退火过程中钴的高游移性及磁致伸缩效应 ,导致钴离子向内核扩散 ,改变了内核及表层的晶格结构。

After being annealed at high temperature, the structure of cobalt soaked ultrafine Fe particles changed obviously. Corresponding X_ray diffraction spectrum showed that the structure of α_Fe and cobalt ferrite had been distorted. This is because of the high mobility of Co 2+ and the magnetostriction of cobalt ferrite resulting in Co 2+ diffusion into inner layer and formation of Fe_Co alloy with α_Fe core.