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Abstract:

Bismuth-iron oxides with partial substitution of bismuth by yttrium, referred as (Bi1-xYx)FeO 3, 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, Hc, 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 (Bi 1-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.© 2014 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation
Autor:Medina, L.M.S.; Jorge, G.A.; Martín Negri, R.
Filiación:Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE), Universidad de Buenos Aires, Argentina
Instituto de Ciencias, Universidad Nacional de General Sarmiento, Buenos Aires, Argentina
Palabras clave:Bismuth-iron oxides; Impedance analysis; Magnetization; Multiferroic compounds; Yttrium substitution; Coprecipitation method; Coprecipitation synthesis; Dielectric and magnetic properties; Dielectrical properties; Impedance analysis; Magnetization curves; Multiferroics; Superparamagnetic behavior; Bismuth; Bismuth compounds; Coprecipitation; Electric impedance; Iron oxides; Leakage currents; Magnetization; Sol-gels; Yttrium; Yttrium compounds; Yttrium alloys
Año:2014
Volumen:592
Página de inicio:306
Página de fin:312
DOI: http://dx.doi.org/10.1016/j.jallcom.2013.12.243
Título revista:Journal of Alloys and Compounds
Título revista abreviado:J Alloys Compd
ISSN:09258388
CODEN:JALCE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09258388_v592_n_p306_Medina

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Citas:

---------- APA ----------
Medina, L.M.S., Jorge, G.A. & Martín Negri, R. (2014) . Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation. Journal of Alloys and Compounds, 592, 306-312.
http://dx.doi.org/10.1016/j.jallcom.2013.12.243
---------- CHICAGO ----------
Medina, L.M.S., Jorge, G.A., Martín Negri, R. "Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation" . Journal of Alloys and Compounds 592 (2014) : 306-312.
http://dx.doi.org/10.1016/j.jallcom.2013.12.243
---------- MLA ----------
Medina, L.M.S., Jorge, G.A., Martín Negri, R. "Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation" . Journal of Alloys and Compounds, vol. 592, 2014, pp. 306-312.
http://dx.doi.org/10.1016/j.jallcom.2013.12.243
---------- VANCOUVER ----------
Medina, L.M.S., Jorge, G.A., Martín Negri, R. Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation. J Alloys Compd. 2014;592:306-312.
http://dx.doi.org/10.1016/j.jallcom.2013.12.243