沸腾回流法制备纳米NiZn铁氧体的研究

Nanometer NiZn Ferrite Prepared by Refluxing Method

尖晶石结构NiZn铁氧体具有优良的高频特性，即在较高的应用频率下，仍保持高磁导率、大电阻率、低损耗和高温度稳定性等特点，因此，在电子通讯高频领域有着广泛的应用，如各种电感磁芯、天线和脉冲变压磁芯等。早在上世纪60年代，国内外的研究者开始了NiZn铁氧体材料的制备研究。在早期的研究中，NiZn铁氧体的制备主要是采取传统的氧化物球磨法，此法能耗大、效率低、易混入杂质，而且合成温度高，所得的粉料颗粒大、活性低，给后续的陶瓷烧结带来困难。

Nanometer NiZn ferrite powder with spinel structure was prepared by a new chemical method - refluxing method. Refluxing time and pH value of coprecipitation were discussed based on the XRD analysis and pH value measurement. The optimum refluxing time and pH value of coprecititation were 6 hours and 9.5-11.0, respectively. Ni0.5Zn0.5Fe2O4 powder prepared by refluxing method was about 20 nm by TEM analysis. And VSM results revealed that the prepared Nio.5Zn0.5Fe2O4 powder had typical soft magnetic characteristics.