Abstract: In this paper, organic-coated Co metallic soft-magnetic microspheres with the average diameter at around 5 μm have been prepared by solvothermal method. We got several kinds of products by using different reducing agents in various conditions. The results of XRD(X-Ray Powder Diffraction), FT-IR(FT-IR Spectromete), SEM(Scanning Electron Microscope), TEM(Transmission Electron Microscope)showthe material structure and surface characteristics of prepared samples. The size of the sample was about 5 μm, and it is obvious that there is organic package layer on the cobalt surface.The package was made by situ parcel method successfully. After 3 months, Co was not oxygenated by the result of XRD. Furthermore, We found the samples have outstanding thermal stability at 450 oC and soft-magnetic properties by using TG-DTA(Thermogravimetry-Differential thermal analysis)and VSM(Vibrating Sample Magnetometer) test. The Bs/Hc can respectively reach to as high/low as 169 emu/g /50 Oe as well as the Br less that 10 emu/g. Additionally, there is some positive connect between the formation and property of final products and the key experimental conditions, such as amounts of surfactant P123 or solvent.

Key words: solvothermal method, Co microspheres, soft magnetic properties, thermostability

摘要： 以醋酸钴为钴源，乙二醇为溶剂，氢氧化钠为添加剂，三嵌段共聚物P123为表面活性剂，采用溶剂热法一步制备了有机物包裹的Co微米颗粒。通过表征测试发现，有机物包裹的Co微米颗粒为球状，粒径均匀，尺寸约5 μm左右。通过热重以及磁性能测试发现，所制备的有机物包裹Co微米颗粒在450 ℃以内热稳定性良好；饱和磁感应强度高达169 emu/g，矫顽力低至50 Oe，剩磁在10 emu/g以内，软磁性能良好。本研究中以常用溶剂水、乙醇为参照组进行了对比实验，并对样品进行了表征和性能测试。此外，本研究进一步探讨了表面活性剂P123对样品结构及性能的影响。

关键词: 溶剂热法, 钴微米球, 软磁性能, 热稳定性