摘要：以Zn(NO₃)₂.6H₂O、Ni(NO₃)₂.6H₂O和Fe(NO₃)₃.9H₂O及柠檬酸为原料,采用溶胶-凝胶法制备前驱体,在1 200℃下煅烧3 h合成ZnFe₂O₄和Ni_0.5Zn_0.5Fe₂O₄铁氧体粉体。利用差热分析、X射线衍射、扫描电镜、透射电镜和红外光谱等测试手段对产物进行分析和表征。结果表明:ZnFe₂O₄和Ni_0.5Zn_0.5Fe₂O₄属于立方晶系尖晶石结构,结晶完整,晶粒大小在100 nm左右。在0.21.8 GHz的频率下对产品进行了电磁损耗性能测试,发现Ni_0.5Zn_0.5Fe₂O₄具有较好的电磁损耗特性。

关键词： 镍锌铁氧体；溶胶-凝胶法；电磁损耗

Abstract：Ni_0.5Zn_0.5Fe₂O₄ ferrite was synthesized by sol -gel method withZn(NO₃)₂.6H₂O and Ni(NO₃)₂.6H₂O andFe(NO₃)₃.9H₂O and C₆H₈O₇· H₂O as raw materials. The products were characterized and analyzed by thermo-gravimetric/differential thermal analyzer （TG/DTA）， X-ray diffraction （XRD）， scanning electron microscopy （SEM）， transmission electron microscopy （TEM） and infrared （IR） spectrum. The results indicated that ZnFe₂O₄ and Ni_0.5Zn_0.5Fe₂O₄ both appeared spinel structure of cubic crystal system and the crystals were crystallized with good integrality. The size of crystal grains was about 100 nm. The electromagnetic loss property of the sample was tested. The results showed that Ni_0.5Zn_0.5Fe₂O₄had a better magnetic loss property than that of ZnFe₂O₄ at 0.2~1.8 GHz. 

Keywords： Ni-Zn ferrite； sol-gel method； electromagnetic loss