Large magnetic entropy change at room temperature in La0.7Ca0.3-xKxMnO3

被引：45
作者：
Bejar, M.
Dhahri, R.
Dhahri, E.
Balli, M.
Hlil, E. K.
机构：
[1] CNRS, Lab Cristallog, F-38042 Grenoble 9, France
[2] Fac Sci Tunis, Appl Phys Lab, Sfax 3018, Tunisia
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 442卷 / 1-2期
关键词：
magnetocaloric; oxide materials; entropy;
D O I：
10.1016/j.jallcom.2006.10.170
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Polycrystalline perovskite samples of La0.7Ca0.3-xKxMnO3 (0.05 <= x <= 0.10) have been prepared using the solid-state reaction. Detailed measurements of the magnetization as function of temperature and magnetic field for these samples were carried out. Significant magnetic-entropy changes (Delta S-Mmax) near the Curie temperature are obtanied from the magnetization data. The increase of the K concentration x is accompanied by a decrease of Delta S-Mmax from 3.95 to 3.49 J/kg K for x = 0.05 and 0.10, respectively, with mu H-0 = 2 T. For all samples, we find quite large values of Delta S-Mmax, which are very close to that provided by Gd the prototypical magnetocaloric material. In view of theses results, the La0.7Ca0.3-xKxMnO3 compounds are strongly recommended to use as an active magnetic refrigerant for magnetic refrigerators. (c) 2007 Elsevier B.V. All rights reserved.
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收藏
页码：136 / 138
页数：3
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