Magnetic Properties and Morphology of the Cobalt Particles Prepared in Different Liquid Solvent

摘要：

　　The two kinds of flower-like ultrafine cobalt particles were prepared by reducing cobalt chloride(CoCl2·6H2O) with hydrazine hydrate(N2H4·H2O) under ultrasonic and microwave radiation,in which ethanol-water or ethylene glycol-water mixture was used as solvent.The morphology,crystal structure and magnetic properties of the as-prepared particles were characterized by scanning electron microscope (SEM),x-ray diffraction pattern (XRD) and vibrating sample magnetometer (VSM).The results show that the petals of the flower-like cobalt particles prepared in the ethanol-water system were dendritic,while the petals of the flower-like cobalt particles prepared in the ethylene glycol-water system were sword-like.The crystal structure of cobalt particles prepared in the two kinds of systems both consisted of hexagonal close-packed cubic phase and face-centered cubic phase,but the relative content was different.The saturation magnetization of the cobalt particles with dendritic petals and the cobalt particles with sword-like petals was the same approximately,but their coercivity was greatly different (the difference in value about 7184.14A?m-1),which might be attributed to the magnetocrystalline anisotropy and shape anisotropy.

关键词： Cobalt particles Hydrazine reduction Coercivity

作者: Xuemin Huang Quansheng Wang Ying Liu Xiuchen Zhao Shulai Wen

作者单位: School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 192-197

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）