resumo
Single phase Bi0.7La0.3FeO3 ceramic samples were successfully synthesized by sol-gel combustion and co-precipitation methods, performing a final sintering at 820-870 degrees C from 10 up to 180 min. Rietveld refinements of the XRD data detected small satellite peaks that were successfully indexed by an incommensurated modulated structure model. Lanthanum doping improves magnetic response, reduces the leakage current and dielectric losses. The piezoelectric coefficient was reported for the first time in the Bi0.7La0.3FeO3 composition. (C) 2012 Elsevier B. V. All rights reserved.
palavras-chave
BIFEO3 CERAMICS; CRYSTAL-STRUCTURE; MAGNETIC-PROPERTIES; PHASE-TRANSITION; BISMUTH FERRITE; RARE-EARTH; LA; FERROMAGNETISM; NANOPARTICLES; POLARIZATION
categoria
Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
autores
Carvalho, TT; Fernandes, JRA; de la Cruz, JP; Vidal, JV; Sobolev, NA; Figueiras, F; Das, S; Amaral, VS; Almeida, A; Moreira, JA; Tavares, PB
nossos autores
Fábio Gabriel Nazário Figueiras
Bolseiro de pós-Doutoramento
Javier Pérez de La Cruz
Bolseiro de pós-Doutoramento
João Vasco Silvestre Vidal
Bolseiro de pós-Doutoramento
Vitor Brás Sequeira Amaral
Professor CatedráticoProjectos
MULTIFOX: Nanometric Probing and Modification of Multiferroic Oxides (PTDC/FIS/105416/2008)
Research on Magnetic and Multiferroic Materials using Radioactive Isotopes at ISOLDE-CERN (CERN/FP/109357/2009)
Perturbed Angular Correlations and Electron Channeling Experiments at ISOLDE - applied materials research with nuclear techniques, training and development (CERN/FP/116320/2010)
agradecimentos
This work was supported by the Fundacao para a Ciencia e Tecnologia (FCT) of Portugal through projects PTDC/CTM/99415/2008, PTDC/FIS/105416/2008, CERN/FP/109357/2009, CERN/FP/116320/2010 and CQVR/PEst-C/QUI/UI0616/2011. T. T. Carvalho also acknowledges the FCT for the PhD grant (SFRH/BD/41331/2007).