Structure, Magnetic, and Ferroelectric Properties of Bi1-xGdxFeO3 Nanoparticles
Structure, Magnetic, and Ferroelectric Properties of Bi1-xGdxFeO3 Nanoparticles
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DOI：
10.1021/jp1103142
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
Weiwei Hu;Yan Chen;Hongming Yuan;Guanghua Li;Y. Qiao;Yuanyuan Qin;S. Feng
中科院分区：
文献类型：
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作者：
Weiwei Hu;Yan Chen;Hongming Yuan;Guanghua Li;Y. Qiao;Yuanyuan Qin;S. Feng
采用多元醇法合成了Bi 1-xGdxFeO 3（x = 0，0.1，0.2，0.3）纳米粒子。它们显示了从x = 0的菱形相（R3 c）到x = 0.2和0.3的正交相（Pn 21 a）的成分驱动的相变，并且x = 0.1是两个相的混合物。在室温下，所有具有中等极化值的样品都观察到了改善的铁电电滞回线。Gd离子取代Bi增强了该系统的铁磁性能。饱和磁化强度为0.11 μB/f. u。在300 K时，纳米粒子的反铁磁核和铁磁表面以及结构畸变是导致纳米粒子反铁磁核和铁磁表面的主要原因。磁化曲线的温度和磁场依赖性揭示了该系统的受抑磁行为。不同反应温度下磁性的变化也与倾斜反铁磁Fe亚晶格和顺磁Gd亚晶格之间的竞争有关。
Bi1-xGdxFeO3 (x = 0, 0.1, 0.2, 0.3) nanoparticles were synthesized by polyol-mediated method. They show a compositional-driven phase transition from a rhombohedral phase (R3c) for x = 0 to an orthorhombic phase (Pn21a) for x = 0.2 and 0.3, and x = 0.1 is a mixture of both phases. Improved ferroelectric hysteresis loops are observed at room temperature for all samples with moderate polarization values. The substitution of Gd ions for Bi enhances the ferromagnetic properties of this system. A large saturated magnetization of 0.11 μB/f.u. is obtained at 300 K, which is mainly attributed to the antiferromagnetic core and ferromagnetic surface of the nanoparticles, together with the structural distortion. Temperature- and field-dependence of magnetization curves reveal the frustrated magnetic behavior of this system. The variation of magnetic behaviors at different reaction temperatures is also related to the competition between canted antiferromagnetic Fe sublattice and paramagnetic Gd sublattice.