溶胶-凝胶自燃烧法合成镍铜锌纳米晶铁氧体及其吸波性能的研究  

Synthesis of Nanocrystalline Ni_(0.25)Cu_(0.25)Zn_(0.5)Fe_(2-x)Ce_xO_4 Ferrite by Sol-gel Auto-combustion and Characterization of Its Absorption Properties

作　　者：张伟[1] 李国栋[1] 孙银凤[1] 

机构地区：[1]内蒙古大学物理系,内蒙古呼和浩特010021

出　　处：《稀土》2007年第4期43-46,共4页Chinese Rare Earths

基　　金：内蒙古自治区自然科学基金项目资助(20010901-10)

摘　　要：利用溶胶-凝胶自燃烧法合成了Ni0.25Cu0.25Zn0.5Fe2-xCexO4纳米晶铁氧体。借助DTA和XRD技术,对干凝胶的热分解过程、合成纳米晶的成分及其吸波性能进行了研究。结果表明,由金属硝酸盐和柠檬酸形成的干凝胶具有自燃烧的特性。通过自燃烧反应可以直接获得镍锌铜铁氧体粉末,经900℃热处理后可以转变成单一的尖晶石相,吸波性能测试发现,Ni0.25Cu0.25Zn0.5Fe2-xCexO4的吸波性能在8.2GHz^12.5GHz范围内随x的变化而不同,当x=0.07时,吸波性能最好,最高吸收峰值达到29.634dB。Nanocrystalline Ni0.25Cu0.25Zn0.5Fe2-xCexO4 ferrite powders were synthesized by sol-gel auto-combustion method . The thermal decomposition process,composition of ferrite powders and absorption properties were investigated by DTA and XRD techniques. The results revealed that gels made from nitrate and citric acid has a self-propagating property. The results of XRD revealed that Ni0.25Cu0.25Zn0.5Fe2-xCexO4 ferrite powders can be obtained after auto-combustion and single spinel phase were formed after subsequent heattreat. The absorption properties of Ni0.25Cu0.25Zn0.5Fe2-xCexO4 have been tested. The absorption properties changed with doping content x in the frequency range of 8. 2GHz- 12.5GHz. The optimal absorption can be achieved when x= 0. 07 and the maxium absorption peak is 29. 634dB.

关 键 词：溶胶-凝胶 自燃烧 Ni0.25Cu0.25Zn0.5Fe2-xCexO4 吸波性能 稀土 

分 类 号：TM277[一般工业技术—材料科学与工程] O614.33[电气工程—电工理论与新技术]