Synthesis and multiferroism in mechanically processed BiFeO3-PbTiO3 ceramics

Autor(es)

Freitas, Valdirlei Fernandes ^[1] ; Cotica, Luiz Fernando ^[1] ; Santos, Ivair A. ^[1] ; Garcia, Ducinei ^[2] ; Eiras, Jose Antonio ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Maringa, Grp Desenvolvimento Dispositivos Multifunc, Dept Fis, BR-87020900 Maringa, PR - Brazil

^[2] Univ Fed Sao Carlos, Grp Ceram Ferroeletr, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 31, n. 15, p. 2965-2973, DEC 2011.
• Citações Web of Science: 29

Resumo

In this study, (1-x)BiFeO(3)-(x)PbTiO(3) multiferroic ceramics, with x = 0, 0.1, 0.2, 0.25, 0.3 and 0.4, were processed through high-energy ball milling followed by reactive sintering in air atmosphere. The optimization of the procedure for the preparation of highly-dense (1-x)BiFeO(3)-(x)PbTiO(3) ceramics was carefully investigated and structural/microstructural effects on ferroic properties were carefully addressed. Shrinkage dilatometric measurements revealed an expansion related to a sintering reaction that has occurred before densification. This sintering behaviour was highly PbTiO(3) concentration-dependent. The sintering mechanism was found to be directly related with the aliovalent substitution of Pb and Ti ions on A and B sites of the perovskite structure. The obtained ceramics were confirmed as ferroelectric ordered in ferroelectric characterizations. Remnant polarizations and coercive fields greatly dependent on grain size distribution and aliovalent substitutions were revealed. The magnetic hysteresis displayed a weak-ferromagnetic behaviour in all studied samples. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/04025-0 - Materiais multifuncionais multiferróicos nanoestruturados: síntese, propriedades, fenomenologia e aplicações
• Beneficiário: José Antonio Eiras
• Modalidade de apoio: Auxílio à Pesquisa - Temático