气泡液膜法-水热法制备Ni0.3Zn0.7Fe2O4磁性材料

Preparation of nanosized Ni_(0.3)Zn_(0.7)Fe_2O_4 using gas bubble liquid membrane process and hydrothermal method

首先采用气泡液膜法制备以Fe(OH)3、Ni(OH)2、Zn(OH)2组成的Ni0.3Zn0.7Fe2O4纳米前驱体,然后在高压水热条件下进行水热处理,制备出Ni0.3Zn0.7Fe2O4纳米粉体。X射线衍射仪(XRD)分析表明,Ni0.3Zn0.7Fe2O4纳米粉体不含有杂相,晶粒度约为16nm。用振动样品磁强计(VSM)测量其磁滞回线,结果表明,Ni0.3Zn0.7Fe2O4纳米粉体有较高的饱和磁化强度(87.56A.m2/kg),较小剩磁(14.35A.m2/kg),具有较好的应用前景。

By means of a gas bubble liquid membrane（GBLM） process the Ni0. 3Zn0. 7Fe2O4 precursor was prepared from the precipitation reaction of FeCl3, NiCl2 and ZnCl2 mix aqueous solution with NaOH aqueous solution with the use of sodium stearate as coating agent. Pure Ni0. 3Zn0. 7Fe2O4 magnetic materials were obtained after the precursor was cured with hydrothermal（HT） method at subcritical temperature of water, which was verified by XRD. VSM measurements show that saturation magnetization of the ferrite is up to be 87. 56A·m2/kg, and magnetic coercivity Hc to be 14A·m2/kg. These implied the potential application of GBLM-HT process in the large scale production of ferrites at low temperature.