Dielectric investigations in unconventionally processed TbMnO3 ceramics

Autor(es)

Gotardo, Ricardo A. M. ^[1] ; Zabotto, Fabio L. ^[1] ; Garcia, Ducinei ^[1] ; Eiras, Jose A. ^[1] ; Dias, Gustavo S. ^[2] ; Cotica, Luiz F. ^[2] ; Santos, Ivair A. ^[2] ; Coelho, Adelino A. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Fis, BR-13565345 Sao Paulo - Brazil

^[2] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana - Brazil

^[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Dept Fis Aplicada, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCRIPTA MATERIALIA; v. 68, n. 5, p. 293-296, MAR 2013.
• Citações Web of Science: 2

Resumo

TbMnO3 ceramics with enhanced dielectric properties were synthesized by an innovative route combining high-energy ball milling and hot-forging sintering. Dielectric investigations reveal the presence of two distinct relaxation processes: one thermally activated mostly due to dipolar effects and other related to the movement of polar clusters or electric dipoles. Long-range polar order was not achieved, as ferroelectricity in TbMnO3 is strongly dependent on the crystallographic direction. A distribution of relaxation times indicates a cooperative response of the electric dipoles. (c) 2012 Acta Materialia Inc. Published by 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