关键词: 溶剂热法, 钴微米球, 软磁性能, 热稳定性

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