Cu及Mn掺杂NiZn铁氧体的合成及磁性能研究  

Preparation and Magnetic Properties of Mn and Cu Doped NiZn Ferrites

作　　者：葛洪良[1] 孙历娜 金顶峰[1] 金红晓[1] 陈敏[1] 褚宁杰[1] 吴琼[1] 李良[1] 王新庆[1] 

机构地区：[1]中国计量学院浙江省磁性材料重点实验室,浙江杭州310018

出　　处：《稀有金属材料与工程》2010年第S2期284-287,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(20801050);国家质检总局科技计划项目(2007QK60);浙江省分析测试科技计划项目(2007F70043)

摘　　要：利用溶胶-凝胶法制备尖晶石结构的Ni0.7-yZn0.3CuyFe2O4(y=0,0.1,0.2及0.3)。经微结构以及磁性能的研究发现,铜掺杂使样品在700℃时就形成了完全的尖晶石相,并且当铜掺入量为y=0.1时,样品的晶粒最大,最大值Ms达到66.7(A·m2)/kg。在此基础上,研究Mn掺杂对制备的样品(Ni0.6Zn0.3Cu0.1)1-xMnxFe2O4(x=0,0.01,0.02,0.03)的磁性能以及微观结构的影响。结果发现,铁氧体粉体的Ms随着Mn的增加基本保持不变;而环状样品的Bs,Br和Hc与锰含量以及烧结温度有着明显的变化关系,Bs和Br随着锰含量的增大先减小后增大,最小值分别达到Bs=305mT,Br=242mT。而矫顽力随锰含量的增大而增大。另外,Br与Bs都随着烧结温度的增大而增加,Hc减小。当烧结温度达到1050℃时,Hc,Bs和Br都趋于一个恒定的值。Low Cu and Mn substituted NiZn ferrites with compositions of (Ni0.6Zn0.3Cuy)1-xMnxFe2O4 (y=0, 0.1, 0.2 0.3 and x=0, 0.01, 0.02, 0.03) were prepared by a sol-gel method. With Cu doping, samples calcined at 700 oC presented the spinel structure, and saturation magnetization (Ms) reached maximum (66.7(A?m2)/kg) at y=0.1. With increasing of Mn2+ content, Ms hardly changed. Saturation magnetic flux density (Bs) and remnant magnetic flux density (Br) of the toroidal specimens decreased with the Mn2+ content up to x = 0.02, i,e. Bs= 305 mT and Br= 242 mT, and then increased. Br and Bs both increased with the sintering temperature, while coercivity (Hc) decreased. Hc, Bs and Br approached constant after calcined above 1050 oC.

关 键 词：NIZN铁氧体 尖晶石结构 掺杂 磁性能 

分 类 号：O646.8[理学—物理化学]