热分解法制备Ni0.5Zn0.5Fe2O4纳米颗粒

摘要

采用热分解法制备Ni0.5Zn0.5Fe2O4纳米颗粒,研究表面活性剂用量、回流温度和回流时间对产物尺寸、形貌以及分散性的影响.通过X射线衍射仪(XRD)、透射电子显微镜(TEM)和振动样品磁强计(VSM)对样品的结构、形貌与磁性能进行了表征.结果表明:增加表面活性剂的用量,产物的粒径减小,分散性明显提高,而提高回流温度和延长回流时间则会使产物粒径增加,但粒径分布也会变宽.在三辛基氧化膦(TOPO)用量为0.6mmol,260℃回流1h条件下制备产物的饱和磁化强度为49.38A·m2/kg,矫顽力为7143.20A/m,剩余磁化强度为5.76A·m2/kg,表现为亚铁磁性.%Ni0.5Zn0.5Fe2O4 nanoparticles were synthesized by thermal decomposition method.The influence of reaction conditions such as the amount of the surfactant, refluxing temperature and time on the size, morphology and dispersibility was investigated.The structure, morphology and magnetic properties of the samples were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM) and vibrating sample magnetometry(VSM).The results indicate that increasing the amount of the surfactant is beneficial to obtain samples with smaller particle size and better dispersibility, and the improving refluxing temperature and extending refluxing time is beneficial to obtain samples with larger particle size, but with wider size distribution.The saturation magnetization of the sample is determined to be 49.38A·m2/kg, coercivity is 7143.20A/m and remanent magnetization is 5.76A·m2/kg with ferrimagnetic behavior at room temperature when the reaction condition is determined as follows, the amount of TOPO is 0.6mmol, the refluxing temperature is 260℃ and the refluxing time is 1h.