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Type: Artigo de periódico
Title: Coercivity behavior in Gd(Co1-xCux)(5) system as function of the microstructure evolution
Author: Penton-Madrigal, A
de Oliveira, LAS
Sinnecker, JP
Souza, DM
Grossinger, R
Concepcion-Rosabal, B
Estevez-Rams, E
Diaz-Castanon, S
Abstract: Magnetic measurements, X-ray diffraction and scanning electron microscopy (SEM) experiments were carried out in the as-cast Gd(Co1-xCux)(5) samples with different Co/Cu content. Already in the as cast state, this system shows high coercive field for x = 0.3 and a magnetization driven by nucleation of reversal domain. SEM micrograph and microanalysis show possible spinodal decomposition in the as-cast state, hence regions with different Co/Cu-content are observed, while the Gd-content almost does not change. High resolution X-ray diffraction patterns show a main CaCu5-type structure with traces of a secondary phase and distorted peak profiles as function of the Cu content. The evolution of the microstructure is discussed in relation with the Cu incorporation into the CaCu5-type structure. The Cu addition avoids the formation of the 2:7 phase within the 1:5 matrix, favoring the formation of a more homogeneous Gd(Co, Cu)(5) phase. The relation between the observed microstructure and the magnetic behavior is also discussed. (C) 2013 Elsevier B.V. All rights reserved.
Subject: Permanent magnets
High coercivity materials
Rare earth metals and alloys
Intermetallic compounds
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physica B-condensed Matter. Elsevier Science Bv, v. 414, n. 67, n. 71, 2013.
Rights: fechado
Identifier DOI: 10.1016/j.physb.2013.01.024
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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