Artículos de revistas
Heat Flow Measurements And The Order Of The Magnetic Transition In (dy,gd)co 2 Solid Solutions
Registro en:
Journal Of Alloys And Compounds. , v. 513, n. , p. 615 - 619, 2012.
9258388
10.1016/j.jallcom.2011.11.027
2-s2.0-83555161551
Autor
De Sousa V.S.R.
Monteiro J.C.B.
Dos Reis R.D.
Medina A.N.
Gama S.
Von Ranke P.J.
Gandra F.C.G.
Institución
Resumen
In this work we present scanning heat flow measurements in the series of compounds Dy 1-xGd xCo 2 (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 (DyCo 2) to 1.8 J/kg K (Dy 0.7Gd 0.3Co 2) 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. © 2011 Elsevier B.V. All rights reserved. 513
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