Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/82155
Type: Artigo
Title: Multiferroic behavior of lead-free alFeO3 and mn, nb doped compositions
Author: Santos, G. M.
Silva, D. M.
Freitas, V. F.
Dias, G. S.
Coelho, A. A.
Pal, M.
Santos, I. A.
Cotica, L. F.
Guo, R.
Bhalla, A. S.
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.
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: Propriedades magnéticas
Cristais ferroelétricos
Compostos de ferro
Country: Estados Unidos
Editor: Taylor & Francis
Citation: Ferroelectrics. Taylor & Francis Ltd, v. 460, n. 1, n. 108, n. 116, 2014.
Rights: fechado
Identifier DOI: 10.1080/00150193.2014.875332
Address: https://www.tandfonline.com/doi/full/10.1080/00150193.2014.875332
Date Issue: 2014
Appears in Collections:IFGW - Artigos e Outros Documentos

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