锰锌铁氧体纳米粒子的制备和磁性能研究

Synthesis and magnetic properties of Mn-Zn ferrite nanoparticles

以金属离子的硫酸盐溶液和氨水溶液为原料，采用水热法制备了粒径为6～16nm的锰锌铁氧体纳米粒子。采用XRD、TEM、TGA和VSM等方法对产物以及产物的磁性能进行了表征。结果表明，锰锌铁氧体（Mn1-xZnxFe2O4）的居里温度随着锌的相对含量x的增加而单调的降低。锰锌铁氧体的磁化强度先随着锌的相对含量x的增加而增大，当锌的相对含量〉0．6时，磁化强度随着锌的相对含量x的增加而减小。测量了锰锌铁氧体磁流体的饱和磁化强度，计算了锰锌铁氧体（Mn0.4Zn0.6Fe2O4）纳米粒子的磁矩，其值为1．01×10^-19A·m^2。

6~16nm Mn-Zn ferrite nanoparticles were synthesized by a hydrothermal precipitation approach using metal sulfate solution and aqueous ammonia. The analysis methods of XRD,TEM,TGA and VSM were used to character the products. The results show that the curie temperature of the Mn-Zn ferrite decreases with the in- crease of comparatively content of Zn. The magnetization intensity of Mn-Zn ferrite increases with the increase of comparatively content of Zn and decreases when comparatively content of Zn is larger than 0.6. Saturation magnetization of the Mn-Zn ferrite magnetic fluid was measured and the magnetic moments of Mn0.4Zn0.6Fe2O4 nanoparticles were calculated,its value was 1.01 × 10^-19Am·m^2.