Effect of holmium substitution for the improvement of multiferroic properties of BiFeO3
Effect of holmium substitution for the improvement of multiferroic properties of BiFeO3
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DOI：
10.1016/j.jpcs.2010.08.001
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发表时间：
2010-11
影响因子：
4
通讯作者：
S. Pradhan;J. Das;P. Rout;V. Mohanta;S. Das;S. Samantray;D. Sahu;Jow-Lay Huang;S. Verma
中科院分区：
文献类型：
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作者：
S. Pradhan;J. Das;P. Rout;V. Mohanta;S. Das;S. Samantray;D. Sahu;Jow-Lay Huang;S. Verma
本文报道了Ho取代BiFeO 3（Bi 1 − xHoxFeO 3）陶瓷的多铁性。当x=0.15时，在300 K时，即使体系保持在菱面体（R3 c）相而没有出现任何可观察到的杂质相，也能观察到明显的铁电回线。当x=0.15时，在10 K下观察到一个形状良好的M-H环。然而，它显示出铁磁性，证实了Ho 3+对增强BiFeO 3在300 K的铁磁性的贡献。抑制纯BiFeO 3块体陶瓷中的杂质相有利于减少移动的氧空位，降低漏电流，从而提高BiFeO 3的铁电性能。我们认为，在Bi位的Ho取代可能会抑制螺旋自旋调制，同时增加倾斜角，这有利于增强多铁性。通过XRD、SEM、磁化强度、极化率和化学键分析等测试手段对样品的多铁性进行了解释。
This paper reports on multiferroic properties of Ho substituted BiFeO3(Bi1−xHoxFeO3) ceramics. It is observed that for x=0.15, a prominent ferroelectric loop is seen at 300K even if the system remains in rhombohedral (R3c) phase without appearance of any observable impurity phases. A well shaped M–H loop is observed at 10K for x=0.15. However it showed ferromagnetism, confirming the contribution of Ho3+towards enhancement of ferromagnetic properties of BiFeO3at 300K. Suppression of impurity phases of pure BiFeO3bulk ceramic favors the reduction of mobile oxygen vacancies and reduces leakage current, due to which ferroelectric properties of BiFeO3is enhanced. We argue that Ho substitution at Bi site is likely to suppress the spiral spin modulation and at the same time increase the canting angle, which favors enhanced multiferroic properties. XRD, SEM, magnetization, polarization and chemical bonding analysis measurements were carried out to explain the multiferroic behavior.