钆、镁共掺杂Y型钡铁氧体的磁介电耦合效应  

Magnetodielectric Coupling in the Gd and Mg Co-Doped Y-Type Barium Ferrite

作　　者：孙萌 杨阳 周剑平[1] SUN Meng;YANG Yang;ZHOU Jianping(School of Physics and Information Technology,Shaanxi Normal University,Xi’an 710119,China)

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710119

出　　处：《聊城大学学报（自然科学版）》2025年第1期43-50,共8页Journal of Liaocheng University:Natural Science Edition

基　　金：中央高校基本科研业务费创新团队项目(GK201901005)资助。

摘　　要：采用固相烧结法合成了Ba_(2-x)Gd_(x)Zn_(2)Fe_(12-x)Mg_(x)O_(22)(x=0.0,0.1,0.2,0.3)陶瓷样品。X射线粉末衍射图谱表明钆、镁掺杂减小了样品的晶格参数,通过扫描电子显微镜观察到掺杂稍微改变了样品的微观形貌。介电性能分析表明,随掺杂量的增加,样品的介电常数提高,并在低温下产生介电色散现象。50 K以上的磁介电现象是电子跳跃运动、磁阻效应和Maxwell-Wagner效应等共同作用的结果。在掺杂x=0.1样品中,调制出非共线磁结构,产生本征磁介电效应。研究结果为磁介电提供了基础理论价值。Ba_(2-x)Gd_(x)Zn_(2)Fe_(12-x)Mg_(x)O_(22)(x=0.0,0.1,0.2,0.3)ferrite ceramics were synthesized by a solid-state reaction method.X-ray powder diffraction pattern and scanning electron microscopy results show that Gd and Mg doping reduce the ferrite lattice parameters and slightly change the morphology of ceramic.The dielectric parameters of the sample increase with the doping amount.The dielectric dispersion occurs at lower temperatures.The magnetodielectric phenomena above 50 K are caused by the joint action of electron jumping motion,magnetoresistive effect,and Maxwell-Wagner effect.The co-doping of gadolinium and magnesium ions affects the magnetic structure to be non-collinear spin order,producing an intrinsic magnetodielectric effect,especially in the sample of x=0.1.The research results provide fundamental value for magnetic dielectrics.

关 键 词：固相法 六角铁氧体 掺杂 介电性能 磁介电效应 

分 类 号：O469[理学—凝聚态物理]