酞菁钴/纳米铁复合颗粒的结构与微波电磁特性

一些铁磁性金属及其合金超细粉末，具有比饱和磁化强度高、易于合成与粒径可控等优点，因此被广泛应用于磁流体、电磁流变液、微波吸收材料等领域，但由抗氧化性差、密度较大等主要缺点而使其应用受到限制，采用有机／无机复合技术可制备具有有机包覆层的有机／无机复合颗粒，不仅可以增强铁磁性颗粒的抗氧化性，减小了密度，而且可以提高与有机基体的亲和性，为该类材料向更高层次发展提供了可能。

Structure and Microwave Electromagnetic Properties of Cobalt

Cobalt-Phthalocyanine/Iron (CoPc/Fe) nanocomposite particles were prepared using mehods of organic-inorganic composite in situ with cobalt-phthalocyanine(CoPc) and carbonyl iron. The structure of composite particles was characterized by density measurement, XRD, SEM and TEM. The results show that CoPc/Fe nanocomposites with density of 3.99 g· cm－ 3 were almost micro-sized regular spheroids consisting of α -Fe nanoparticles with average diameter 20 nm in inner and CoPc layer on the surface of spheroids. Further, microwave electromagnetic parameters of CoPc/Fe nanocomposite particles was measured, and the dependences of ε r and μ r on frequency were investigated. Compared with carbonyl iron powders, the composite permittivity ε r significantly decreases while composite permability μ r changes slightly, which may increases the width of microwave absorbing frequency.