Magnetic and magnetocaloric properties of La0.7Ca0.3-xBaxMnO3 compounds

被引：143
作者：
Phan, MH
Tian, SB
Yu, SC [1 ]
Ulyanov, AN
机构：
[1] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea
[2] Natl Acad Sci, Donetsk Physicotech Inst, UA-83114 Donetsk, Ukraine
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 256卷 / 1-3期
关键词：
magnetocaloric effect; entropy; refrigeration; perovskite manganite;
D O I：
10.1016/S0304-8853(02)00584-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Magnetic properties and magnetocaloric effect in La0.7Ca0.3-xBaxMnO3 (x = 0.12, 0.24, 0.3) compounds were investigated. It is shown that there is a large magnetic entropy change associated with the ferromagnetic-paramagnetic transition. The Curie temperature (T-C) increases with the barium addition, while the maximum entropy change (\DeltaS(M)(max)\) slightly decreases. La0.7Ca0.18Ba0.12MnO3 exhibits the largest \DeltaS(M)(max)\ value of 1.85 J/kg/K at 298 K among the compounds investigated Lip to 10kOe applied field. Through these results, La0.7Ca0.3-xBaxMnO3 materials are strongly suggested for the use of active refrigerants for magnetic refrigeration technology near and above room temperature. (C) 2002 Elsevier Science B.V. All rights reserved.
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收藏
页码：306 / 310
页数：5
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