Structure, Magnetic, and Ferroelectric Properties of Bi1-xGdxFeO3 Nanoparticles

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• 作者：Weiwei Hu ; Yan Chen ; Hongming Yuan ; Guanghua Li ; Yu Qiao ; Yuanyuan Qin ; Shouhua Feng
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：May 12, 2011
• 年：2011
• 卷：115
• 期：18
• 页码：8869-8875
• 全文大小：984K
• 年卷期：v.115,no.18(May 12, 2011)
• ISSN：1932-7455

文摘

Bi_1-xGd_xFeO₃ (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 渭_B/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.