Structural, dielectric and magnetic properties of Bi1-xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation

JOURNAL OF ALLOYS AND COMPOUNDS

卷:592

Article

Saleh Medina, Leila Maria¹  Jorge, Guillermo A.²  Martin Negri, R.¹ 

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Quim Inorgan Analit & Quim Fis, Inst Quim Fis Mat Ambiente & Energia INQUIMAE, RA-1053 Buenos Aires, DF, Argentina

[2] Univ Nacl Gen Sarmiento, Inst Ciencias, Buenos Aires, DF, Argentina

关键词: Multiferroic compounds;    Bismuth-iron oxides;    Yttrium substitution;    Magnetization;    Impedance analysis;   

DOI  :  10.1016/j.jallcom.2013.12.243

来源: Elsevier

【 摘 要 】

Bismuth-iron oxides with partial substitution of bismuth by yttrium, referred as (Bi1-xYx)FeO3, were synthesized by simple-low cost acid-base co-precipitation method, which constitutes a difference with the currently used synthetic methods for obtaining BiFeO3-doped compounds (e. g. polymer assisted sol-gel, solid state, microwave, etc.) Samples were characterized by XRD, EDS, SEM, TEM, DSC and FTIR. The influence of yttrium (Y) substitution on magnetization curves of (Bi1-xYx)FeO3 powders were studied at room temperature by VSM. The particle size systematically decreases with the Y percentage. Ferromagnetic curves were obtained at room temperature for Y-percentage lower than 20% with relatively large values of the coercive field, H-c, which increases with Y-substitution, while for 20% yttrium a superparamagnetic behavior is observed. The electrical impedance of compressed disks were investigated also by impedance analysis in the range 1Hz-1MHz and the results were successfully fitted by a simple parallel R-C model. The dc-leakage currents are lower than previously reported for (Bi1-xYx)FeO3 compounds and for most of the doped-BiFeO3 ceramics. As a difference with the influence on the magnetic behavior, the doping with yttrium does not seem to have a large influence on the dielectrical properties. These results suggest that magnetization can be systematically modified by the relatively simple co-precipitation synthesis while keeping invariable the dielectrical properties. (C) 2014 Elsevier B. V. All rights reserved.

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