以金属硝酸盐为原料,通过乙二胺四乙酸(EDTA)络合法制备了尖晶石型NN1-xZnxFe2O4(x=0.0-0.7)晶体.通过TG-DTA考察了制备过程,采用XRD,FT-IR,SEM和VSM等对产物进行了表征,研究了热处理温度和Zn取代量对晶型结构和磁学性质的影响.同传统的固相法相比(1300rC/20h),制备单相Ni-Zn铁氧体所需的焙烧温度降至700℃焙烧时间缩短至2h.随着Zn取代量的增加,晶胞参数递增,而矫顽力(HC)和居里温度(TC)逐渐下降.饱和磁化强度(MS)随Zn取代量呈先递增至x=0.4后再逐渐下降.在1.5 MHz的交变磁场中,所制粒子的感应温度接近设计的居里温度,能够适于感应加热的应用.
Spinel Ni-Zn ferrite with composition Ni1-xZnxFe2O4(x＝0.0-0.7)were prepared by EDTA-complexing method using their corresponding metal nitrates as raw materials.The synthesis process was monitored by thermogravimetric and differential thermal analysis(TG-DTA).The obtained samples were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM)and vibrating sample magnetometer(VSM).The effects of calcination temperature and zinc substitution concentration on crystal structure and magnetic properties were studied.A single phase Ni-Zn ferrite with high crystallinity was completely formed at relatively lower temperature(700℃)and shorter reaction time(2h),compared with conventional solid state reaction (1300℃ /20h ),With the increase of zinc concentration,lattice parameter increases,while the coercivity(HC)and Curie temperature(TC)decreases monotonously.Saturation magnetization(MS)showed an increasing trend up to x =0.4 and then a decline with increasing zinc concentration.Exposed in the I.5MHz AC magnetic filed,the induction temperature of the obtained particles approached the designed Cure point,which would be useful as susceptor materials for induction heating.
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