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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:323

Article

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 

[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

关键词: Magnetocaloric effect;    Anisotropy;    Ferrimagnetism;    Rare earth alloy;   

DOI  :  10.1016/j.jmmm.2010.10.046

来源: Elsevier

【 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.

【 授权许可】

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