单分散超细球状镍的制备及其磁性分析  

Preparation and Magnetic Analysis of Monodisperse Ultrafine Nickel Spheres

作　　者：张军[1] 王修才[1] 李莉莉[1] 李承轩[1] 李晶晶[1] 

机构地区：[1]河南科技大学化工与制药学院,河南洛阳471023

出　　处：《河南科技大学学报（自然科学版）》2013年第4期98-100,104,共4页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(21076063);河南省科技攻关基金项目(102102210170);洛阳市科技攻关基金项目(1101030A);洛阳市矿产资源化工重点实验室建设基金项目(1003016A)

摘　　要：采用水热法,以四水乙酸镍为镍源、次亚磷酸钠为还原剂,在水热条件下,借助聚乙烯吡咯烷酮的结构导向和稳定作用,制备出了单分散超细球状镍。考察了温度、聚乙烯吡咯烷酮用量等对产物形貌的影响。以X射线粉末衍射、透射电镜、扫描电镜和超导量子干涉方法进行了表征和分析。研究结果表明:产物为面心立方镍;颗粒大小均匀,表面光洁,产物具有明显铁磁性,剩磁、饱和磁强度和矫顽力分别达到2.03 A.m2.kg-1、24.2 A.m2.kg-1和1.26 A.m-1,均超过了普通镍粉。The monodisperse ultrafine nickel spheres were prepared via a hydrothermal reduction approach using nickel acetate tetrahydrate as the reductant and polyvinyl pyrrolidone as the structure-directing agent.The influence of the reduction temperature and the dosage of PVP were investigated.It has been verified from XRD,TEM and SEM that as-prepared products with high purity and fine dispersity belong to face-centered cubic structure.The magnetic hysteresis loop measured at 300 K by superconducting quantum interference method exhibits the ferromagnetic characteristics with an enhanced magnetic coercivity in comparison with the bulk counterparts.The remanent magnetization ( Mr) ,saturation magnetization ( Ms) and coercivity ( Hc) reach 2.03 A.m2.kg-1 ,24.2 A.m2.kg-1 and 1.26 A.m-1 ,respectively.

关 键 词：水热法 结构导向剂 单分散 镍 磁性 

分 类 号：TQ423[化学工程] O614[理学—无机化学]