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采用机械合金法制备了纳米复合材料Fex(SiO2 ) 1-x系列样品 .用X射线粉末衍射 (XRD)、透射电子显微镜 (TEM )、M ssbauer谱和Faraday磁天平系统地研究了该系列样品不同Fe合量和不同球磨时间的微结构和磁性 .实验表明样品的微结构和磁性与球磨时间和Fe含量密切相关 .当样品的Fe含量少于 2 0wt% ,并球磨了 80h后呈现出非常复杂的微观结构 :α Fe纳米晶粒和Fe团簇镶嵌在SiO2 基质中 ,形成α Fe纳米岛状和纳米尺度的类三明治结构 .Fe SiO2 界面的相互作用和渗透效应、纳米晶的尺寸效应和类三明治的特殊微观结构导致了纳米复合材料Fex(SiO2 ) 1-x的物理性能的变化
The Fex (SiO2) 1-x series of nanocomposites were prepared by mechanical alloying.The samples of this series were systematically investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), M ssbauer spectroscopy and Faraday magnetic balance Fe content and microstructure and magnetic properties of different ball milling time.Experiments show that the microstructure and magnetic properties of the sample are closely related to the ball milling time and Fe content.When the Fe content of the sample is less than 20wt% : Α Fe nanocrystals and Fe clusters are embedded in the SiO2 matrix to form α Fe nano-island-like and nanoscale sandwich-like structures. The interaction and permeation effect of Fe-SiO 2 interface, the size effect of nanocrystals and the like The special microstructure of the sandwich results in a change in the physical properties of the nanocomposite Fex (SiO2) 1-x