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

被引：144

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.

引用

页码：306 / 310

页数：5

共 14 条

[1] MAGNETORESISTANCE IN MAGNETIC MANGANESE OXIDE WITH INTRINSIC ANTIFERROMAGNETIC SPIN STRUCTURE [J].