羰基铁/SiO_2磁性核壳复合粒子研究  

Study on Fe/SiO_2 Core-shell Magnetic Composite Particles

作　　者：吴文华[1] 杨坤涛[2] 

机构地区：[1]华中科技大学光电工程系,湖北武汉430074 [2]鄂州大学电信系,湖北鄂州436000

出　　处：《磁性材料及器件》2006年第2期31-33,共3页Journal of Magnetic Materials and Devices

摘　　要：采用溶胶-凝胶方法制备了羰基铁/SiO2核壳复合粒子。采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、红外测试分析仪(FTIR)、振动样品磁强计(VSM)、热重分析仪(TG-DTA)等对材料形貌、微观结构、分子结构与性能进行表征,并分析了羰基铁粉表面包覆机理。实验结果表明,羰基铁粒子表面被均匀地包覆非晶态SiO2纳米壳层。包覆后的核壳复合粒子仍具有很好的超顺磁性能,适当控制壳层的厚度可以提高超顺磁性能,同时抗氧化性能也明显提高。Carbonyl-iron composite particles are uniformly coated with nano-SiO2 by sol-gel method. The coating mechanism of carbonyl iron particles is studied; at the same time, the morphology, microstructure and properties of the composite particles are characterized by TEM, SEM, XRD, FTIR, VSM, DSC-TG The results show that the prepared particles with core-shell structure have a shell of within 40nm in thickness; the core-shell particles still exhibit superparamagnetism; meanwhile, the anti.oxidation property is obviously improved.

关 键 词：核壳结构 羰基铁粉 性能 包覆机理 

分 类 号：TM27[一般工业技术—材料科学与工程]