论文部分内容阅读
采用一种新方法——一步还原法制备了纳米铁粉颗粒。过量的柠檬酸在620℃有助于形成纯相、结晶高的α-Fe。纳米铁粉被X射线衍射(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)进行了表征,形貌观察表明产物形成了粒径在30 nm左右的近球形的纳米颗粒。磁滞回线说明了纳米铁颗粒的饱和磁化强度为198.97 A·m~2/kg,作为磁性材料具有很好的铁磁性能。一步还原法生产的颗粒粒径分布窄、可控、流程短,可用于大规模生产。
A new method - one-step reduction method was used to prepare nano-iron particles. Excess citric acid helps to form a pure, high-crystalline α-Fe at 620 ° C. The nano-sized iron powders were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). Morphology observation showed that the nano-sized iron nanoparticles formed near-spherical nanoparticles with a diameter of about 30 nm. The hysteresis loop shows that the saturation magnetization of the nano-iron particles is 198.97 A · m ~ 2 / kg, which has good ferromagnetic properties as a magnetic material. The particle size distribution produced by the one-step reduction method is narrow, controllable and has a short process. It can be used for mass production.