以酒石酸和金属硝酸盐为原料,采用低热固相反应方法合成了Ni_(0.18)Cu_(0.2)Zn_(0.62)O(Fe_2O_3)_(0.98)尖晶石型铁氧体,并应用FT-IR,DSC-TG,XRD,TEM以及SEM等技术对低热固相反应过程和样品进行了研究和表征.FT-IR研究表明,酒石酸和金属硝酸盐在研磨30 min后发生了低热固相反应,生成金属酒石酸盐前驱体.FT-IR和XRD分析表明,前驱体经不同温度焙烧后得到单一尖晶石相的NiCuZn铁氧体粉.依据谢乐公式计算和TEM表征,证明干凝胶在350℃分解1h后的粒径约为20～30 nm,将此粉体在750℃下焙烧2 h后,粒径增大到100～150 nm.铁氧体于900℃烧结为陶瓷体后,晶粒约为2～4 μm,烧结致密.随着烧结温度由850℃提高到900℃,NiCuZn铁氧体的矫顽力H_c有所下降,但饱和磁化强度M_s有所升高.磁谱测量表明,900℃烧结样品的磁导率为170,截止频率为32 MHz,样品的磁性主要来源于畴壁位移的贡献.
Ni_(0.18)Cu_(0.2)Zn_(0.62)O( Fe_2O_3 )_(0.98)ferrite powders with spinel structure were synthesized by low-heating solid-state reaction method. FT-IR spectra, DSC-TG and XRD techniques were employed to investigate the solid-state reaction and the thermal decomposi-tion of the gel precursors. The results showed that the metal nitrates could react with the tartaric acid by grinding for 30 rain. The re-suits of X-ray diffraction technique revealed that NiCuZn ferrite powders were of the single spinel phase and the spinel crystal structure integrated gradually with the increase of the calcinations temperature. According the calculation of the Scherrer formula and the TEM a-nalysis, the particle size of ferrite was about 20 ～ 30 nm when the dried gel decomposed at 350 ℃ for 1 h. With the increase in cal-tered under 900 ℃ with properties of μ_i = 170 and cutoff frequencies = 32 MHz. The magnetizing mechanism of the materials mainly re-suited from domain wall motion.
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