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Type: Artigo de periódico
Title: Multiferroic Behavior of Lead-free AlFeO3 and Mn, Nb Doped Compositions
Author: Santos, GM
Silva, DM
Freitas, VF
Dias, GS
Coelho, AA
Pal, M
Santos, IA
Cotica, LF
Guo, R
Bhalla, AS
Abstract: The lead-free AlFeO3-based compounds are attractive multiferroic materials, as those present piezoelectricity and ferrimagnetism at low temperatures. In this work the synthesis and ferroic properties of AlFeO3-based ceramics were investigated. Stoichiometric proportions of the precursors - alpha-Fe2O3 and alpha-Al2O3 - were milled and sintered to obtain AlFeO3 ceramics. Also, AlFeO3 ceramics doped with 2at% of Nb2O5 or MnO2 were sintered in oxygen flow at 1700K. The crystal structure of the samples was studied by X-ray diffraction. The diffractograms were refined by the Rietveld method. The results obtained from refinements showed an orthorhombic symmetry with space group Pna2(1). Dielectric, ferroelectric and magnetic investigations suggested a magnetoelectric coupling between the electric and magnetic orderings at temperatures below similar to 160K for AlFeO3, Al(Fe0.98Nb0.02)O-3 and Al(Fe0.98Mn0.02)O-3, where the compositions show the ferromagnetic and ferroelectric ordering.
Subject: multiferroic magnetoelectrics
magnetic properties
Country: Inglaterra
Editor: Taylor & Francis Ltd
Rights: fechado
Identifier DOI: 10.1080/00150193.2014.875332
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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