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Type: Artigo de periódico
Title: Magnetic ordering and instability investigation of multiferroic Pb(Fe2/3W1/3)O-3 ceramics by microwave dielectric spectroscopy
Author: Fraygola, B
Coelho, AA
Garcia, D
Eiras, JA
Abstract: The microwave dielectric and magnetic properties of Pb(Fe2/3W1/3)O-3 multiferroic ceramics were investigated. A dielectric dispersion occurring in the frequency range 100 MHz-3 GHz and in a broad temperature range showed itself to be a powerful tool to detect magnetostrictive effects. The experimental results revealed the following remarkable features: the temperature dependence of f(R) (characteristic frequency) and the dielectric strength Delta epsilon (characteristic of the dispersion) enabled us to identify not only the para-ferroelectric (T-C approximate to 180 K) but also the para-antiferromagnetic (T-N approximate to 340 K) phase transitions, while magnetic measurements revealed the para-antiferromagnetic ordering and a weak superexchange interaction (T-N2 similar to 15 K). Additionally, both characterizations confirmed the existence of structural or magnetic instabilities around 250 K. (C) 2011 Elsevier Ltd. All rights reserved.
Subject: Multiferroics
Lead iron tungstate
Microwave dielectric spectroscopy
Phase transitions
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Solid State Communications. Pergamon-elsevier Science Ltd, v. 151, n. 23, n. 1810, n. 1813, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.ssc.2011.08.020
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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