溶胶-凝胶法制备 Ni0.5Zn0.5Fe2O4纳米材料特性的研究

利用溶胶．凝聚法制备了Ni0.5Zn0.5Fe2O4粉末材料，烧结温度范围600℃-950℃。对材料的结构、红外、磁学和微波吸收特性进行了研究。材料的XRD图谱和原子力显微镜形貌观察表明，材料在纳米尺度范围之内。在500cm-1--600cm-1波数范围内，材料具有明显的红外吸收特性。材料的晶粒尺寸随着烧结温度的提高而增加，且较高温度烧结的材料具有相对低的矫顽力和饱和磁场。利用反射衰减实验研究材料在6GHz--10GHz波段范围的吸波特性，结果表明，0．33mm厚度的样品在常温下的反射衰减达到1．8dBm。

Preparation and Characterization of Ni0.5Zn0.5Fe2O4 Nanomaterials via Sol-Gel Technique

Ni0.5Zn0.5Fe2O4 powder is synthesized by sol-gel technique and sintered at 600 ℃ -- 950 ℃. Structural, infrared and magnetic properties of materials, as well as microwave absorbing test were investigated. Both X-ray diffraction （XRD） spectra and atomic force microscopy （AFM） topography image demonstrate that the powder size is on nanometer scale level. Infrared absorbing band over 500 cm-1 -- 600 cm-1 are clearly observed for the powder. High sintering temperature leads to larger grain size, as well as lower coercivity field and saturating filed appearing in the sample for the magnetic properties. The microwave reflection attenuation could reach to 1.8 dBm over the frequency range from 6 GHz to 10 GHz for the sam- ples with an average thickness of 0.33 mm.