氯化胆碱-乙二醇-水溶液制备镍铁氧体

Preparation of Nickel Ferrite by Using a Mixed Solution of Choline Chloride-ethylene Glycol and Water

以氯化胆碱-乙二醇(ChCl-EG)和水混合溶液为介质,依据三因素五水平均匀设计实验方案,采用溶胶/凝胶-自蔓延法,制备了镍铁氧体(NiFe_(2)O_(4))。X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和振动样品磁强计(VSM)分析结果表明:NiFe_(2)O_(4)中存在少量前驱体焙烧过程中未反应完全的中间产物NiO和α-Fe_(2)O_(3);相较于传统水溶剂制备的NiFe_(2)O_(4),以ChCl-EG部分或完全取代水溶剂提高了NiFe_(2)O_(4)的饱和磁化强度(Ms),降低了其矫顽力(Hc)。扫描电子显微镜(SEM)分析结果表明,ChCl-EG完全取代水溶剂后产物的形貌更加规整,颗粒尺寸明显增大。对均匀实验结果进行回归分析,分别得到了M_(s)、H_(c)与合成主要影响因素(ChCl-EG含量、pH、柠檬酸与金属离子物质的量比)间的回归方程,根据回归方程阐明了主要影响因素对NiFe_(2)O_(4)磁性能的影响。

According to the three-factor five-level uniform design scheme of experiment,with mixed solution of choline chloride-ethylene glycol(ChCl-EG)and water as the medium,,Nickel ferrite(NiFe_(2)O_(4))was synthesized by sol-gel self-propagating method.The analysis of X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and vibrating sample magnetometer(VSM)indicate that there are a small amount of intermediate products NiO andα-Fe_(2)O_(3)in the prepared NiFe_(2)O_(4).Compared with NiFe_(2)O_(4)prepared by traditional water solvent,the saturated magnetization(M_s)of the prepared NiFe_(2)O_(4)is increased and its coercivity(H_c)is reduced by partially or completely replacing the water solvent with ChCl-EG.The results of scanning electron microscopy(SEM)analysis shows that the morphology of the product is more regular and the particle size increases significantly after the water solvent is completely replaced by ChCl-EG.M_(s),H_(c),and the main factors affecting the synthesis(ChCl-EG content,pH value,and amount of substance ratio of citric acid to metal ions)are obtained by regression analysis of the uniform experimental results,and then the influence of main factors on the magnetic properties of NiFe_(2)O_(4)are illustrated through regression equations.