高能球磨法合成纳米晶NiZn铁氧体的结构和磁性

Structure and magnetic properties of anocrystalline NiZn-ferrite fabricated by high-energy milling method

报告了作者利用机械球磨方法成功制备纳米晶NiZn铁氧体软磁材料的实验结果。实验样品具有很好的单相结构,所形成材料典型晶粒尺度为10～50nm。结合纯Fe3O4球磨样品,初步估算其样品的合成效率大约为27%～44%,这一结果可利用两步合成及中间纳米颗粒的高活性给予理解。对本实验利用球磨方法直接获得的NiZn铁氧体样品表现出较低的磁化强度σm和较大的矫顽力Hc,其典型值为43Am2kg-1和377×103(4π)-1A/m。从实用化角度而言,必要的热处理将是必要的。实验进一步证明,除了传统的机械合金化制备纳米晶软磁合金材料以外,利用高能球磨制备纳米晶NiZn软磁铁氧体也将是一种有效可行的新方法。

The nanocrystalline NiZn-ferrite was successfully fabricated by the high-energy milling method. The milled powder has a typical size of 10～50nm about and a good NiZn-ferrite phase structure. The results show that there is the relative lower saturation magnetization and large coercivity. Their typical values of saturation magnetization and coercivity are 43Am^2kg^(-1) and 3.67×10~5(4π)^(-1)A/m, respectively. The experiment reveals also that the NiZn-ferrite material can be obtained by high-energy milling besides the traditional method. The mechanism and the efficiency of synthesis technique are also discussed.