Fast synthesis of rare-earth (Pr3+, Sm3+, Eu3+and Gd3+) doped bismuth ferrite powders with enhanced magnetic properties

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[1] [1,Iorgu, A.I.
[2] Maxim, F.
[3] Matei, C.
[4] 3,Ferreira, Liliana Pires
[5] Ferreira, P.
[6] 3,Cruz, M.M.
[7] Berger, D.
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Maxim, F. (fmaxim@icf.ro) | 1600年 / Elsevier Ltd卷 / 629期
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Rare-earth; (Pr3+; Sm3+; Eu3+ and Gd3+) doped bismuth ferrite powders were synthesized for the first time by solution combustion method; which is a fast soft chemistry route for obtaining oxide powders. The materials were investigated by X-ray diffraction; Raman spectroscopy; as well as scanning and transmission electron microscopy. A distortion from rhombohedral R3c symmetry; specific to pure bismuth ferrite; to orthorhombic symmetry was observed for all doped samples. The SEM analysis of pure and doped bismuth ferrite powders showed the formation of sintered grains; with faceted cuboids-shaped particles with different size and lower average dimension in the case of doped samples. Magnetic properties were analyzed using SQUID magnetometry; M-H hysteresis loops being measured at 10 K and 300 K. All studied pure and doped bismuth ferrite samples presented high susceptibility values for high magnetic fields indicating strong antiferromagnetic interactions; whereas the behavior at low magnetic field demonstrates the existence of ferromagnetic coupling. Compared to BiFeO3; Bi0.9RE0.1FeO3; (RE; Pr; Sm; Eu and Gd) powders exhibit higher susceptibility; remanence and coercivity values; Bi0.9Eu0.1FeO3 sample displaying the highest remanence and coercivity at room temperature. © 2014 Elsevier B.V. All rights reserved;
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