共沉淀法制备锰锌铁氧体微粉的研究

以硫酸亚铁、硫酸锰和硫酸锌为原料,采用碳酸盐共沉淀法制备了Mn1–xZnxFe2O4(x=0,0.2,0.4,0.5和0.6)铁氧体微粉。通过TGA-DSC、XRD和SEM等测试手段,分析其物相、微观结构和形貌,并用振动样品磁强计(VSM)测量其室温磁滞回线,重点探讨了锰锌铁氧体前驱粉在热处理过程中发生的反应。磁性能测试表明,随着Zn2+含量的增加,锰锌铁氧体微粉的比饱和磁化强度先增加后降低,当x(Zn2+)=0.2时,微粉的比饱和磁化强度最大,为84.24A·m2·kg–1。

Study on MnZn ferrite micropowder prepared by co-precipitation method

Mn1–xZnxFe2O4 (x = 0, 0.2, 0.4, 0.5 and 0.6) ferrite micropowder was prepared by carbonate co-precipitation method from metal sulfate solution using ammonium bicarbonate as precipitant. The physical phase, microstructure and morphology of the micropowder were characterized by TGA-DSC, XRD and SEM. Its hysteresis loops (room temperature) were measured by VSM. The chemical reactions during the heat-treatment of the precursor prepared by co-precipitation were discussed. The results show that the specific saturation magnetization of MnZn ferrite micropowder increases first, and then decreases with the increase of Zn2+ content, the maximum of specific saturation magnetization is 84.24 A·m2·kg–1 at x = 0.2 (Zn2+ content).