info:eu-repo/semantics/article
Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation
Fecha
2014-04Registro en:
Saleh Medina, Leila María; Jorge, Guillermo Antonio; Negri, Ricardo Martin; Structural, dielectric and magnetic properties of Bi1 -xYxFeO3 (0 ≤ x ≤ 0.2) obtained by acid-base co-precipitation; Elsevier Science Sa; Journal of Alloys and Compounds; 592; 4-2014; 306-312
0925-8388
CONICET Digital
CONICET
Autor
Saleh Medina, Leila María
Jorge, Guillermo Antonio
Negri, Ricardo Martin
Resumen
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.