文献类型：期刊文献

英文题名：Preparation, characterization and magnetic properties of nano-Fe 3O4 and cobalt-doped nano-Fe3O4 by CO-precipitation method

作者：Liang, Xiaojuan[1]; Huan, Weiwei[2]; Jia, Xiangchen[2]; Ding, Haijun[2]; Yang, Yuxiang[2]; Liu, Xiangnong[3]

机构：[1] Dalian Maritime University, Dalian, 116021, China; [2] Department of Chemistry, East China University of Science and Technology, 200237, China; [3] Analysis Test Center, Yangzhou University, Yangzhou, 225009, China

年份：2010

卷号：5

期号：4

起止页码：203

外文期刊名：Nano

收录：EI(收录号：20110213556588)

语种：英文

外文关键词：Coercive force - Coprecipitation - Nanoparticles - Magnetite - Doping (additives) - Magnetism

摘要：Pure nano-Fe3O4 and cobalt-doped nano-Fe 3O4 particles are successfully synthesized by co-precipitation method using tetramethylammonium hydroxide (TMAOH) as alkali. Several key factors that may affect preparation are carefully discussed such as alkali concentration, alkali dosage, reaction temperature, iron salt solution concentration and dispersant agents. Such nano-Fe3O4 particles prepared have good dispersibility and a very narrow size distribution with the average diameter about 38 nm, which are proved to be cubic spinel Fe3O4 crystal by XRD pattern. It is also found that the addition of PEG-4000 surfactant can improve the dispersibility of nanoparticles. In our work, effects of cobalt dopant concentration on magnetic properties of cobalt-doped nano-Fe3O4 are also discussed. The result shows that the coercivity of cobalt-doped nanoparticles changes greatly with the variation of cobalt dopant concentration. The maximum coercivity reaches as high as 1628 Oe, which is very meaningful for preparation of materials with high coercivity. ? 2010 World Scientific Publishing Company.