Fe_2O_3含量对MnZn铁氧体中Fe^(2+)量、磁性能及导电机制的影响  

Effects of Fe_2O_3 content on the Fe^(2+) concentrations, magnetic properties and conductive mechanism of Mn Zn ferrites

作　　者：孙文强[1] 朱朝辉[1] 刘东[1] 应耀 姜力强[1] 车声雷 

机构地区：[1]浙江工业大学材料科学与工程学院磁电功能材料研究所,浙江杭州310014

出　　处：《磁性材料及器件》2015年第2期1-5,共5页Journal of Magnetic Materials and Devices

基　　金：浙江省人力资源和社会保障厅留学人员科技活动择优资助项目

摘　　要：通过测量MnZn铁氧体的磁性能及Fe2+、Mn3+含量,考察了MnZn铁氧体中的Fe2+含量与配方中Fe2O3、MnO含量的关系及其对MnZn铁氧体磁性能的影响,并探究了MnZn铁氧体的导电机制。结果表明:随着(Fe2O3)a(MnO)b(ZnO)c主组成配方中a值递增(52.55≤a≤53.35)、b值递减(38.33≥b≥37.52),呈现出Fe2+、Mn3+含量均增加的趋势。随着Fe2+含量增加,Pcv谷底温度向低温方向移动,Pcv(min)先减后增,Pcv(20/70/100℃)均先减后增,均在Fe2+含量=1.55%附近达到最小值;起始磁导率μi(20/70/100℃)均先增后减。根据Pcv-Fe2+含量和μi-Fe2+含量两个关系图在Fe2O3=53.15mol%附近出现极值点这一现象,初步推测铁氧体Znα2+Mnβ-x2+Mnx3+Fey2+Feχ-y3+O4+σ(0.1794≥α≥0.1786,0.754≥β≥0.734,0.0031≤x≤0.0040,0.051≤y≤0.070)的导电机制为:y<0.064时小极化子间的束缚能主导,y>0.064时电子跃迁主导。Magnetic properties of MnZn ferrites were measured together with the Fe2＋and Mn3＋concentrations for MnZn ferrite samples with the formula of （Fe_2O_3）a（MnO）b（ZnO）c （52.55≤a≤53.35, 38.33≥b≥37.52）. We investigated the relationship between content of Fe_2O_3, MnO and Fe2＋ concentration of MnZn ferrites, and analyzed the conductive mechanism of MnZn ferrites. The result indicates that both Fe2＋ and Mn3＋ contents increase with increasing a and decreasing b. With the increase of Fe^2＋concentration, both Pcv（min） and Pcv（20,70,100℃） decrease first and then increase over the Fe^2＋concentration of about 1.55%, butμi changes in the opposite way. For the conductive mechanism of a MnZn ferrite formulated Znα^2＋Mnβ-x^2＋Mnx^3＋Fey^2＋Feχ-y^3＋O_4＋σ（0.1794≥α≥0.1786,0.754≥β≥0.734,0.0031≤x≤0.0040,0.051≤y≤0.070）, the influence of polaron binding energy is expected to be important at y〈0.064, while electron jump is dominant when y〉0.064.

关 键 词：MNZN 铁氧体 Fe^2+含量 电位滴定 磁性能 导电机制 

分 类 号：TM277.1[一般工业技术—材料科学与工程]