介孔纳米磁性材料的性能控制(英文)  

Tailoring Magnetic Properties of Mesoporous Nanocomposite Materials

作　　者：葛洪良[1] 李良[1] 陈敏[1] 金一彪 金红晓[1] 吴琼[1] 王新庆[1] 

机构地区：[1]中国计量学院浙江省磁性材料重点实验室,浙江杭州310018 [2]横店集团东磁股份有限公司,浙江金华322118

出　　处：《稀有金属材料与工程》2010年第S2期95-98,共4页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China (20571067, 20801050);Education Project of Zhejiang Province (20060521)

摘　　要：以SBA-15介孔分子筛为载体,利用溶胶凝胶-浸渍法合成一种新型纳米结构的磁性材料,同时利用XRD及VSM分析了合成介孔材料的微观结构以及磁性能。结果发现,合成材料的Fe2O3纳米颗粒存在于SBA-15的骨架中,而CoFe2O4纳米颗粒存在于介孔孔道中。介孔纳米磁性材料的磁性能可以通过掺杂CoFe2O4及Fe2O3的含量进行控制。掺杂CoFe2O4样品的饱和磁化强度可达未掺杂样品的12倍。此外,利用Kelly-Hankel(δM)曲线研究了合成介孔纳米磁性材料中CoFe2O4与Fe2O3纳米磁性材料间的交换耦合作用,这可以明显提升合成介孔材料的磁性能。A new nanocomposite magnetic material based on SBA-15 mesoporous molecular sieves was prepared by the sol-gel and immersion method, and then the microstructure and magnetic properties of CoFe2O4/Fe2O3-SBA-15 magnetic nanomaterials were characterized and discussed by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). As designed, the Fe2O3 nanoparticles were presented in the frame and the CoFe2O4 ferrites nanoparticles were confined in the mesopores of SBA-15. The results indicate that magnetic properties (coercive force and saturation magnetization) could be controlled by the content of CoFe2O4 and Fe2O3 in the magnetic nanomaterials. The saturation magnetization of the CoFe2O4 implantation sample was 12 times of that of the undoped one. The couple exchange interaction was confirmed with Kelly-Hankel (δM) curves between CoFe2O4 and Fe2O3 nanoparticles, which enhanced ferromagnetism of as-prepared samples.

关 键 词：SBA-15 溶胶凝胶 磁性能 

分 类 号：O646.8[理学—物理化学]