Phase transitions and magnetoelectroelastic instabilities in Pb(Fe1/2Nb1/2)O-3 multiferroic ceramics

Phase transitions and magnetoelectroelastic instabilities in Pb(Fe1/2Nb1/2)O-3 multiferroic ceramics

Autor Fraygola, B. Google Scholar
Frizon, N. Google Scholar
Lente, M. H. Autor UNIFESP Google Scholar
Coelho, A. A. Google Scholar
Garcia, D. Google Scholar
Eiras, J. A. Google Scholar
Instituição Universidade Federal de São Carlos (UFSCar)
Universidade Federal de São Paulo (UNIFESP)
Universidade Estadual de Campinas (UNICAMP)
Resumo Magnetoelectric coupling can be observed in multiferroic materials in the regions where magnetic and ferroelectric ordering coexist and in many cases is mediated via lattice strain. Pb(Fe1/2Nb1/2)O-3 (PFN) is a well-known multiferroic, presenting ferroelectric ordering (below T-C = 380 K) and a Neel temperature (antiferromagnetic ordering) T-N = 143 K. However, recent experimental results suggest that PFN can display ferromagnetic ordering at higher temperatures and a still unclear sequence of phase transitions. in this work, high-density PFN ceramics were prepared by a conventional ceramic method. Dielectric, magnetic and anelastic responses were measured as a function of temperature. the experimental results present complementary evidence of anomalies (additional to those which can be directly associated with the reported transitions at T-C and T-N) which cold be associated with a structural phase transition (T similar to 315 K), an antiferromagnetic ferromagnetic phase transition (110 K) and magnetoelectroelastic instabilities around 250 K. (C) 2012 Acta Materialia Inc. Published by Elsevier B.V. All rights reserved.
Palavra-chave Multiferroic
Ferroelectrics
Magnetics proprieties
Idioma Inglês
Financiador Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Número do financiamento FAPESP: 2008/04025-0
FAPESP: 2010/11187-6
Data de publicação 2013-03-01
Publicado em Acta Materialia. Oxford: Pergamon-Elsevier B.V., v. 61, n. 5, p. 1518-1524, 2013.
ISSN 1359-6454 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 1518-1524
Fonte http://dx.doi.org/10.1016/j.actamat.2012.11.029
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000316036800010
Endereço permanente http://repositorio.unifesp.br/handle/11600/36029

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