Magnetocaloric effect in Gd(1-y)DyyAl2

被引：12
|
作者：
Alho, B. P. [1 ]
Ribeiro, P. O. [1 ]
Alvarenga, T. S. T. [1 ]
Carvalho, A. Magnus G. [2 ,3 ]
Von Ranke, P. J. [1 ]
机构：
[1] Univ Estado Rio de Janeiro, Inst Fis, BR-20550013 Rio De Janeiro, Brazil
[2] Univ Fed Sao Paulo, UNIFESP, Inst Ciencia & Tecnol, BR-12231280 Sao Jose Dos Campos, RJ, Brazil
[3] INMETRO, Inst Nacl Metrol Qualidade & Tecnol, BR-25250020 Duque De Caxias, RJ, Brazil
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2014年 / 37卷
基金：
巴西圣保罗研究基金会;
关键词：
Magnetocaloric effect; Composite; Rare-earth; Crystalline anisotropy; MAGNETIC-ANISOTROPY; DYAL2;
D O I：
10.1016/j.ijrefrig.2013.07.012
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this work we calculate the magnetic properties and the magnetocaloric effect in Gd-1- yDyyAl2 (y = 0, 0.25, 0.5, 0.75 and 1). The model Hamiltonian includes contributions from the Zeeman effect, the crystalline electrical field anisotropy and the exchange interactions among Gd-Gd, Gd-Dy and Dy-Dy ions. To obtain a composite with Delta S-T as constant as possible in the temperature range from T = 60 K to 170 K, the appropriate concentrations of the five compounds investigated were calculated using the Smaili and Chahine method. The magnetization and Delta S-T dependences on temperature in the composite were simulated and compared with the partial contributions of the single magnetic component materials. Also, the magnetic field dependence on magnetization was investigated in Gd0.25Dy0.75Al2, where the discontinuous spin reorientation transitions were predicted for magnetic fields lower than 2 T, applied along <110> direction. (C) 2013 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码：297 / 302
页数：6
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