有机物原位包裹Co微米球的溶剂热制备及其磁性能

Structure and magnetic properties of organic-coated Co microspheres prepared by solvothermal method

以乙二醇为溶剂、氢氧化钠为添加剂、三嵌段共聚物P123为表面活性剂,一步溶剂热合成了有机物包裹的球状Co颗粒。XRD、SEM、TEM等测试表明,制备的有机物包裹Co颗粒形状均匀,尺寸为5μm左右,有机物在其表面形成了均匀的包裹层。磁性能测试以及热重分析表明,所制备的有机物包裹Co微米颗粒在450℃以下热稳定性良好;饱和磁感应强度高达169emu.g-1,矫顽力低至50Oe,剩磁在10emu.g-1以下,软磁性能良好。以常用溶剂如水、乙醇为参照进行了对比实验,结果表明溶剂在Co微米颗粒的合成中具有关键性的作用。

Organic-coated Co metallic soft-magnetic microspheres were prepared by the solvothermal method using ethanediol as solvent,NaOH as additive and P123 as surfactant.The results of XRD（X-ray powder diffraction）,SEM（scanning electron microscope）,TEM（transmission electron microscope）showed that the size of the samples was about 5 μm in average diameter,and there was obviously an organic package layer on the cobalt surface.Furthermore,it was found that the samples had outstanding thermal stability at 450℃ and soft-magnetic properties by using TG-DTA（Thermogravimetry-differential thermal analysis）and VSM（vibrating sample magnetometer）test.The Ms and Hc could respectively reach as high/low as 169 emu·g-1 and 50 Oe,respectively,as well as the Mr less than 10 emu·g-1.Additionally,several kinds of products were obtained by using different reducing agents in various conditions.The results showed that solvent was the key factor in the synthesis of organic-coated Co metallic soft-magnetic microspheres.