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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Fraygola, B. [1] ; Frizon, N. [1] ; Lente, M. H. [2] ; Coelho, A. A. [3] ; Garcia, D. [1] ; Eiras, J. A. [1]
Total Authors: 6
[1] Univ Fed Sao Carlos, Dpto Fis, Grp Ceram Ferroeletr GCFerr, BR-13565670 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Paulo, Dept Ciencia & Tecnol, BR-12231280 Sao Jose Dos Campos, SP - Brazil
[3] Univ Estadual Campinas, LPCM DFA IFGW, Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ACTA MATERIALIA; v. 61, n. 5, p. 1518-1524, MAR 2013.
Web of Science Citations: 10

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 Ltd. All rights reserved. (AU)

FAPESP's process: 10/11187-6 - Determination of the magnetoelectric coupling coefficient in single phase multiferroic materials
Grantee:Barbara Maraston Fraygola
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 08/04025-0 - Nanostructured multifunctional multiferroic materials: synthesis, properties, phenomenology and applications
Grantee:José Antonio Eiras
Support type: Research Projects - Thematic Grants