Ni_(1-x)Zn_xFe_2O_4铁氧体的制备及其性能研究

Preparation and Properties of Ni_(1-x)Zn_xFe_2O_4 Ferrites

通过化学共沉淀法制备了颗粒较细、粒度分布较均匀、团聚较少的Ni1-xZnxFe2O4前驱体。通过TG-DSC分析、XRD测量、激光粒度分析和形貌观察确定了Ni1-xZnxFe2O4前驱体的优化煅烧温度。以活性Ni1-xZnxFe2O4前驱体为原料,通过固相反应法制备Ni1-xZnxFe2O4陶瓷。不同温度烧结的、不同组成的Ni1-xZnxFe2O4陶瓷均呈现纯尖晶石结构。Zn2+含量、烧结温度对Ni1-xZnxFe2O4陶瓷的结构、密度、物理性能产生重要影响。在相同的烧结温度下,随着Zn2+含量的增加,Ni1-xZnxFe2O4陶瓷的密度、方块电阻、饱和磁化强度呈现增大的趋势。随着烧结温度的升高,Ni1-xZnxFe2O4陶瓷的密度、方块电阻、饱和磁化强度明显增大。

NiNi1-xZnxFe2O4precursor powders in fine particles with rather good size distribution and less conglomeration were prepared by chemical co-precipitation method. The optimized calcination temperatures of the Ni1-xZnxFe2O4 precursors were determined by TG-DSC analysis, XRD measurement, laser particle size analyzer and SEM observation. Ni1-xZnxFe2O4 ceramics were prepared by the solid-state reaction method using the active Ni1-xZnxFe2O4 precursor powders. All the Ni1-xZnxFe2O4 ceramics sintered at different temperatures exhibit pure spinel structure. The concentration of Zn2. cation and sintering temperature exert great influence on crystal structure, density and physical properties of the synthesized Ni1-xZnxFe2O4ceramics. At the same sintering temperature, the values of density, square resistance and saturated magnetization of the Ni1-xZnxFe2O4 ceramics exhibit the tendency to increase. With the increase of sintedng temperature, the values of density, square resistance and saturated magnetization of the Ni1-xZnxFe2O4 ceramics increase apparently.