魏智强,吴永富,刘立刚,冯旺军,杨华,张材荣

• 1:兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室
• 2:兰州理工大学理学院

摘要(Abstract)：

以硅酸乙酯(TEOS)和纳米镍粉为主要原料,通过溶胶-凝胶法制备了SiO2包覆镍核壳结构纳米复合粒子。利用X射线衍射(XRD)、高分辨透射电镜(HRTEM)和选区电子衍射(SAED)、X射线能量色散分析谱仪(EDS)和振动试样磁强计(VSM)等测试手段对样品的晶体结构、形貌、组成元素和磁学性能等特征进行了表征。结果表明:SiO2以非晶态的形式包覆在纳米镍粒子表面,形成了明显的核壳结构,降低了纳米粉体的团聚现象。颗粒大多呈球形或椭球形,粒径分布在20～80 nm范围,平均粒径为30 nm,镍粒子外碳层的厚度为4～6 nm。包覆后的粉体由于SiO2的存在,饱和磁化强度与剩磁比纳米镍粉降低,矫顽力升高。

关键词(KeyWords)： SiO2;核壳结构;纳米复合颗粒;微观结构;磁滞回线

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51261015);; 甘肃省高等学校基本科研项目(1110ZTC138)

作者(Author): 魏智强,吴永富,刘立刚,冯旺军,杨华,张材荣

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