Grain size and Fe2+ concentration‐dependent magnetic, dielectric, and magnetodielectric properties of Y3Fe5O12 ceramics
Grain size and Fe2+ concentration‐dependent magnetic, dielectric, and magnetodielectric properties of Y3Fe5O12 ceramics
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DOI：
10.1002/pssa.201532582
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
Huarui Wu;F. Huang;Xueliang Lu;Tingting Xu;Xiaomei Lu;R. Ti;Yaming Jin;Jinsong Zhu
中科院分区：
文献类型：
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作者：
Huarui Wu;F. Huang;Xueliang Lu;Tingting Xu;Xiaomei Lu;R. Ti;Yaming Jin;Jinsong Zhu
采用固相反应法制备了Y3 Fe 5 O 12陶瓷。系统地研究了粒度和Fe 2+浓度相关的磁性、介电和磁介电性质。结果表明，随着烧结温度的升高，晶粒尺寸和Fe ~（2+）浓度增大，饱和磁化强度增大，矫顽场和剩磁减小。在10 ~ 500 K温度范围内观察到三组介电弛豫，它们分别来源于电子的量子隧穿效应、Fe ~（2+）和Fe ~（3+）之间的电子跳跃以及氧空位的迁移。对弛豫Ⅱ的Cole-Cole拟合结果表明，跳跃电子之间存在相关性，且随着Fe ~（2+）浓度的增加，这种相关性增强，导致跳跃过程更容易进行，激活能降低。更有趣的是，在1350 °C下烧结的YIG陶瓷在室温下显示出相当大的磁性和介电性能，为YIG作为可能的多晶单相材料的应用打开了一扇新的窗口。
Y3Fe5O12 ceramics are prepared by the solid state reaction method. Grain size and Fe2+ concentration‐dependent magnetic, dielectric, and magnetodielectric properties are investigated systematically. It is found that grain size and Fe2+ concentration increase with increasing sintering temperature, which thus results in increased saturation magnetization while decreased coercive field and remanent magnetization. Three sets of dielectric relaxation are observed in temperature range from 10 to 500 K, which are considered to be originated from quantum tunneling effect of electrons, electron hopping between Fe2+ and Fe3+, and the migration of oxygen vacancies, respectively. Cole–Cole fitting results of relaxation II indicate that a correlation exists among the hopping electrons, and the correlation is strengthened as Fe2+ concentration increases, which in turn results in easier hopping process and decreased activation energy. More interesting, YIG ceramics sintered at 1350 °C show both considerable magnetic and dielectric properties at room temperature, opening a new window for the application of YIG as a possible multi‐susceptibile single‐phase material.