Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/329868
Type: Artigo
Title: Reversal Magnetization Dependence With The Cr And Fe Oxidation States In Yfe1-xcrxo3 (0 <= X <= 1) Perovskites
Reversal magnetization dependence with the Cr and Fe oxidation states in YFe1-xCrxO3 (0 <= x <= 1) perovskites
Author: Fabian, F. A.
Pedra, P. P.
Moura, K. O.
Duque, J. G. S.
Meneses, C. T.
Abstract: In this work, we have carried out a detailed study of the magnetic and structural properties of YFe1-xCrxO3 (0 <= x <= 1) samples with orthorhombic structure obtained by co-precipitation method. Analysis of X-ray diffraction data using Rietveld refinement show that all samples present an orthorhombic crystal system with space group Pnma. Besides, we have observed a reduction of unit cell volume with increasing of the Cr concentration. SEM images show the formation of grains of micrometer order. X-ray Absorption near edge spectroscopy (XANES) measurements show a shift of absorption edge which can be indicate there is (i) different oxidation states to Fe and Cr ions and/or (ii) a changing in the point symmetry of Fe and Cr ions to the compounds. The magnetization measurements indicate a continuous decreasing of the magnetic transition temperature as function of chromium doping. The reversal magnetization effect was observed to concentrations around x=0.5. Besides, the deviation of the Curie-Weiss law and a weak ferromagnetic behavior observed at room temperature in the M vs H curves can be attributed to the strong magnetic interactions between the transition metals with different oxidation states. (C) 2016 Elsevier B.V. All rights reserved.
In this work, we have carried out a detailed study of the magnetic and structural properties of YFe1-xCrxO3 (0 <= x <= 1) samples with orthorhombic structure obtained by co-precipitation method. Analysis of X-ray diffraction data using Rietveld refinement show that all samples present an orthorhombic crystal system with space group Pnma. Besides, we have observed a reduction of unit cell volume with increasing of the Cr concentration. SEM images show the formation of grains of micrometer order. X-ray Absorption near edge spectroscopy (XANES) measurements show a shift of absorption edge which can be indicate there is (i) different oxidation states to Fe and Cr ions and/or (ii) a changing in the point symmetry of Fe and Cr ions to the compounds. The magnetization measurements indicate a continuous decreasing of the magnetic transition temperature as function of chromium doping. The reversal magnetization effect was observed to concentrations around x=0.5. Besides, the deviation of the Curie-Weiss law and a weak ferromagnetic behavior observed at room temperature in the M vs H curves can be attributed to the strong magnetic interactions between the transition metals with different oxidation states.
Subject: Perovskite
X-ray Diffraction
Magnetic Properties
Co-precipitation Method
Perovskita, Raios - Difração
Country: Holanda
Editor: Elsevier
Citation: Journal Of Magnetism And Magnetic Materials. Elsevier Science Bv, v. 408, p. 94 - 98, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2016.02.029
Address: https://www.sciencedirect.com/science/article/pii/S0304885316301305
Date Issue: 2016
Appears in Collections:IFGW - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
000372319900016.pdf1.57 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.