纳米Fe颗粒的化学还原制备及结构与磁性表征  

Synthesis of Fe nanoparticles by chemical reduction:structural and magnetic characterization

作　　者：徐津[1,2] 何峻[1] 安静[1] 景永强[1,3] 张羊换[1,2] 赵栋梁[1] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]内蒙古科技大学材料冶金学院,内蒙古包头014010 [3]内蒙古科技大学数理与生物工程学院,内蒙古包头014010

出　　处：《功能材料》2012年第8期1016-1019,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50971044)

摘　　要：室温下通过NaBH4还原FeCl2溶液,在实验过程中加入聚丙烯酸(PAA)作为表面活性剂,制备了粒径大小为3～5nm的Fe纳米颗粒,并在不同温度下对得到的颗粒进行退火。对比了在不同温度下退火对样品的结构及磁性能的影响。结果表明,通过化学还原法制备的Fe纳米颗粒为非晶态,其磁性表现为超顺磁和铁磁的混磁态,随着退火温度的增加Fe纳米颗粒的晶化程度越来越高,其饱和磁化强度和矫顽力逐渐增大,磁性由混磁态逐渐向铁磁态转变。Fe nanoparticles were prepared by chemical reduction method. The precursor of FeC12 was reducing by NaBH4 at room temperature. During the reaction, polyacrylic acid （PAA） was added to the reagent as the surfactant. The nanoparticle size is shaped in the range of 3-Snm when the pH of the reagent is 6. The nanoparticles were then annealed at different temperature in Ar. The influence of annealing temperature on the structure and magnetic properties of Fe nanoparticles were studied. As a result,the Fe nanoparticles which prepared by chemical reduction method are almost amorphous. The magnetic characteristic of the Fe nanoparticles is metamagnetic which consists of superparamagnetic and ferromagnetic. Crystalline degree of Fe nanoparticles are improved as the annealing temperature increase. The magnetic characteristic of Fe nanoparticles is gradually transformed from metamagnetic to the ferromagnetic.

关 键 词：纳米颗粒 化学还原 退火 超顺磁性 磁性能 

分 类 号：TM272[一般工业技术—材料科学与工程]