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Type: Artigo de periódico
Title: Heat flow measurements and the order of the magnetic transition in (Dy,Gd)Co-2 solid solutions
Author: de Sousa, VSR
Monteiro, JCB
dos Reis, RD
Medina, AN
Gama, S
von Ranke, PJ
Gandra, FCG
Abstract: In this work we present scanning heat flow measurements in the series of compounds Dy1-xGdxCo2 (x = 0, 0.1, 0.2, 0.3) which reveal a first order character in the magnetic transition for x = 0 and 0.1. The isothermal entropy change obtained for a magnetic field variation from 0 to 2T shows good agreement with the calculations based on a model Hamiltonian that takes into account the crystal field, magnetoelastic, exchange and Zeeman interactions. The maximum entropy change varies from 7.0 J/kg K (DyCo2) to 1.8 J/kg K (Dy0.7Gd0.3Co2) under a 2T magnetic field variation. The refrigerant cooling power (RCP) varies from 97 J/kg to 67 J/kg across the series. The entropy shows a strong correlation with the transition temperature regardless the transition type. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Magnetocaloric effect
Rare earth - transition metal alloys
Spin Hamiltonians
Country: Suíça
Editor: Elsevier Science Sa
Citation: Journal Of Alloys And Compounds. Elsevier Science Sa, v. 513, n. 615, n. 619, 2012.
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2011.11.027
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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