Investigation on the magnetocaloric effect in (Gd,Pr)Al2 solid solutions

被引：18
|
作者：
de Sousa, V. S. R. [1 ]
Carvalho, A. Magnus G. [2 ]
Plaza, E. J. R. [3 ]
Alho, B. P. [1 ]
Tedesco, J. C. G. [4 ]
Coelho, A. A. [4 ]
de Oliveira, N. A. [1 ]
von Ranke, P. J. [1 ]
机构：
[1] Univ Estado Rio de Janeiro, Inst Fis Armando Dias Tavares, BR-20550013 Rio De Janeiro, Brazil
[2] Inmetro, Div Metrol Mat, BR-25250020 Duque De Caxias, RJ, Brazil
[3] Univ Fed Sergipe, Dept Fis, BR-49100000 Sao Cristovao, Sergipe, Brazil
[4] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2011年 / 323卷 / 06期
基金：
巴西圣保罗研究基金会;
关键词：
Magnetocaloric effect; Anisotropy; Ferrimagnetism; Rare earth alloy;
D O I：
10.1016/j.jmmm.2010.10.046
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A theoretical and experimental investigation on the magnetocaloric properties of the rare earth pseudobinary compounds Gd1-nPrnAl2 is presented. The calculated isothermal entropy and adiabatic temperature changes under magnetic field variations from 0 to 2 T and from 0 to 5 T are in good agreement with the experimental data. For the Pr-concentrations n = 0.25, 0.5 and 0.75 the experimental data present an inverse magnetocaloric effect which was theoretically predicted and associated with the competition between the opposite magnetizations of the Gd and Pr sublattices. The two-sublattice Hamiltonian used in the calculations takes into account the crystal field, exchange and Zeeman interactions. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：794 / 798
页数：5
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