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

Author 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
Institution Universidade Federal de São Carlos (UFSCar)
Universidade Federal de São Paulo (UNIFESP)
Universidade Estadual de Campinas (UNICAMP)
Abstract 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.
Keywords Multiferroic
Magnetics proprieties
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 2008/04025-0
FAPESP: 2010/11187-6
Date 2013-03-01
Published in Acta Materialia. Oxford: Pergamon-Elsevier B.V., v. 61, n. 5, p. 1518-1524, 2013.
ISSN 1359-6454 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 1518-1524
Access rights Closed access
Type Article
Web of Science ID WOS:000316036800010

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