Magnetocaloric effect: Overcoming the magnetic limit

被引：6
|
作者：
Plaza, E. J. R. [1 ,2 ]
Campoy, J. C. P. [1 ]
机构：
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, UNICAMP, BR-13083970 Campinas, SP, Brazil
[2] Univ Estado Rio de Janeiro, Inst Fis, BR-20550013 Rio De Janeiro, RJ, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 05期
基金：
巴西圣保罗研究基金会;
关键词：
Magnetocaloric effect; Exchange entropy; Entropy magnetic limit; HEAT;
D O I：
10.1016/j.jmmm.2008.10.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have studied anomalous peaks observed in magnetocaloric -Delta S(T) curves for systems that undergo first-order magnetostructural transitions. The origin of those peaks, which can exceed the conventional magnetic limit, Rln(2J+1), is discussed on thermodynamic bases by introducing an additional-exchange contribution (due to exchange constant variation arising from magnetostructural transition). We also applied a semiphenomenological model to include this additional-exchange contribution in Gd5Si2Ge2 and MnAs-based systems, obtaining excellent results for the observed magnetocaloric effect. (c) 2008 Elsevier B. V. All rights reserved.
引用
收藏
页码：446 / 449
页数：4
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