纳米γ-Fe_2O_3粉体的合成与磁性增强研究  

A Study on Synthesis ofγ-Fe_2O_3 Powder and Magnetism Enhancement

作　　者：梁晓娟[1] 朱慧[2] 杨宇翔[2] 刘向农 陈娅如[2] 应海平[2] 

机构地区：[1]温州大学应用技术学院,浙江325035 [2]华东理工大学化学与分子工程学院,上海200237 [3]扬州大学测试中心,扬州225009

出　　处：《化学学报》2006年第23期2351-2356,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20577010)资助项目.

摘　　要：采用微乳法合成出氧化铁的前驱体——纳米β-FeOOH,分别以β-FeOOH与添加剂壬基酚聚氧乙烯醚(NP-4)以物质量的比(n)为4,5,100添加NP-4,混合煅烧．采用拉曼光谱分析了样品中炭含量及分布,并且用透射电镜观测产物的形貌和粒径,采用磁强计观测产物磁性的变化．结果得出,对n=5或破乳所得凝胶煅烧,所得样品皆为分散均匀的四方形颗粒状,且为磁性明显增强的纳米氧化铁γ-Fe2O3．还分别讨论了样品中炭含量以及颗粒形状对比饱和磁化强度σs、矫顽力、矩形比的影响．The nano-β-FeOOH for precursor of γ-Fe2O3 was synthesized by microemulsion method, then the β-FeOOH was calcined by mixing with additive polyoxyethylene nonyl phenyl ether （NP-4） in the molar ratio of β-FeOOH/NP-4 as 4, 5 and 100 respectively. The carbon content and distribution in product were determined by Raman scattering, morphology and particle size of the product were observed by TEM, and the variations of the product magnetism with the morphology were measured by VSM. By calcining β-FeOOH with NP-4 in the molar ratio of 5, or calcining gelatin of broken emulsion, the dispersed symmet- rical square y-Fe2O3 with enhanced magnetism was observed. The effects of carbon content and nanoparticle morphology on saturation magnetization σs, coercive force, and squareness were also discussed in this paper.

关 键 词：NP-4添加剂 Γ-FE2O3 磁件增强 

分 类 号：O614.811[理学—无机化学]