NiCuZn铁氧体的制备和磁性研究

Study on synthesis and magnetic propertie of NiCuZn ferrite

用溶胶-凝胶法制备了系列镍铜锌铁氧体微粉。借助于TG-DTA、XRD、SEM、VSM技术,对干凝胶的热分解过程、产物的物相、微观结构和磁性能进行研究。结果表明,反应温度为30℃,镍铜锌铁氧体微粉经800℃烧结后可以转变成尖晶石相,然而,反应温度为50℃,无法获得纯的镍锌铁氧体晶体,而且,由于杂质粒子的存在,饱和磁化强度和低温交换偏置场都减弱。

NiCuZn ferrite powders were prepared by sol-gel method. The themal decomposition, phase composi- tion, microstructure and the magnetic properties of NiCuZn ferrite were investigated by TG-DTA, XRD, SEM and VSM techniques. The results showed when reaction temperature is 30℃ NiCuZn ferrite powders with single spinel phase were formed after subsequent heat treating at 800℃ ,but if reaction temperature is 50℃ the powder is not pure spinal structure. Due to the presence of impurity particles, saturation magnetization and low temper- ature exchange bias field is reduced.