溶胶凝胶法合成镍铜锌铁氧体纳米晶磁性研究  

Magnetic properties of NiCuZn nanocrystals by sol-gel method

作　　者：张变芳[1] 王振彪[1] 闫宗林[1] 刘力虎[2] 李同锴[1] 崔建坡[1] 

机构地区：[1]石家庄铁道学院数理系,河北石家庄050043 [2]河北师范大学物理学院,河北石家庄050016

出　　处：《功能材料》2008年第4期550-552,556,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50625518)

摘　　要：用溶胶-凝胶制备了系列Ni0.2Cu0.2Zn0.6Fe2O4铁氧体微粉。借助于TG-DTA、XRD、SEM、VSM技术,对干凝胶的热分解过程、产物的物相、微观结构和磁性能进行研究。结果表明,Ni0.2Cu0.2Zn0.6Fe2O4铁氧体微粉经800℃烧结后可以转变成尖晶石相。磁滞回线表明,Ni0.2Cu0.2Zn0.6Fe2O4在低温和室温都出现了交换偏置场,这可以用纳米晶的表面的掺杂和结构缺陷导致表面原子的磁结构自旋无序来解释。Ni0.2Cu0.2Zn0.6Fe2O4 ferrite powders were prepared by sol-gel method. The themal decomposition, phase composition, microstructure and the magnetic properties of Ni0.2Cu0.2Zn0.6Fe2O4 ferrite were investigated by TG-DTA, XRD, SEM and VSM techniques. The results showed that Ni0.2Cu0.2Zn0.6Fe2O4 ferrite powders with single spinel phase were formed after subsequent heat treating at 800℃. The hysteresis loops show that Ni0.2Cu0.2Zn0.6Fe2O4 has an exchange bias filed at room temperature and low temperature, which are explained by the magnetic spin disorder of surface atoms resulted from surface adulteration and surface structure defects of Ni0.2Cu0.2Zn0.6Fe2O4 nancocrystalline.

关 键 词：溶胶-凝胶法 结构缺陷 磁滞回线 

分 类 号：TM22[一般工业技术—材料科学与工程] TM27[电气工程—电工理论与新技术]