Significant enhancements of dielectric and magnetic properties in Bi(Fe1−xMgx)O3−x/2 induced by oxygen vacancies
Significant enhancements of dielectric and magnetic properties in Bi(Fe1−xMgx)O3−x/2 induced by oxygen vacancies
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DOI：
10.1088/0022-3727/46/14/145001
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
H. Wu;Y. Lin;J. Gong;F. Zhang;M. Zeng;M. H. Qin;Z. Zhang;Q. Ru;Z. W. Liu;X. S. Gao-
中科院分区：
文献类型：
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作者：
H. Wu;Y. Lin;J. Gong;F. Zhang;M. Zeng;M. H. Qin;Z. Zhang;Q. Ru;Z. W. Liu;X. S. Gao-
采用高能球磨和固相反应法合成了Bi（Fe 1 −xMgx）O3−x/2（x = 0-10%）陶瓷。发现少量Mg掺杂导致介电常数的显著增强（约两个数量级），沿着铁磁性的明显改善。所观察到的显著增强的介电性能可以通过与内部势垒层电容相关联的麦克斯韦-瓦格纳弛豫来解释。铁磁性可以归因于不平衡的Fe 3+自旋的产生和由氧空位捕获的局域电子介导的相对长程耦合。
Bi(Fe1−xMgx)O3−x/2 (x = 0–10%) ceramics were synthesized by high-energy ball milling and solid-state reaction. It was found that a small amount of Mg doping leads to a dramatic enhancement in dielectric permittivity (∼two orders of magnitude), along with an apparent improvement in ferromagnetism. The observed significant enhanced dielectric properties may be interpreted by the Maxwell–Wagner relaxation in association with internal barrier layer capacitance. The ferromagnetism can be ascribed to the creation of unbalanced Fe3+ spins and relative long-range coupling mediated by the oxygen vacancies trapped localized electrons.