锰锌铁氧体纳米颗粒的制备条件

Preparation Conditions of Mn_(1-x)Zn_xFe_2O_4 Ferrite Nanoparticles

用NaOH共沉淀法制备了Mn-Zn铁氧体纳米颗粒,采用正交实验法研究了反应温度、OH-和Fe3+浓度对锰锌铁氧体磁性能的影响。发现各种影响因素中,反应温度对颗粒的磁性能有显著影响,而OH-和Fe3+浓度的影响不大。制得的纳米颗粒粒径细小(10nm),磁性能好,最高比饱和磁化强度可达53A·m2/kg。XRD分析表明产物纯净,其组成为Mn0.8Zn0.2Fe2O4。采用油酸钠进行颗粒的表面改性,其分散性有明显改善。此外,还用SEM、HRTEM等分析手段表征了粒子的微观形貌,并讨论了制备手段和粒子特性对其分散性的影响。

Mn-Zn ferrite nanoparticles were prepared by coprecipitation, A group of orthogonal tests （L4^5） was arranged to investigate the effects of reaction temperature, OH^- and Fe^3＋ concentration on the magnetic properties of Mn-Zn ferrite. It was found that the saturation magnetization increases evidently with increasing reaction temperature, but the effects of OH^- and Fe^3＋ concentrations on the magnetic property are minor. Mn-Zn ferrite nanoparticles with excellent magnetization were obtained. The saturation magnetization of the nanoparticles can be as high as 53A.m^2/kg measured by VSM. XRD analysis indicates that particle is pure Mn0.8Zn0.2Fe2O4. The synthesized magnetic nanoparticles were coated with oleic acid to improve the particle dispersion. Besides, several techniques such as SEM and TEM were also used to characterize the synthesized nanoparficles.