Magnetocaloric properties and Landau theory of Dy0.5(Sr1-xcax)0.5MnO3 (0 ≤ x ≤ 0.3) manganites at cryogenic temperatures

被引：30
|
作者：
Hamdi, R. [1 ]
Tozri, A. [1 ]
Dhahri, E. [1 ]
Bessais, L. [2 ]
机构：
[1] Univ Sfax, Lab Phys Appliquee, BP 1171, Sfax 3000, Tunisia
[2] UMR 7182 CNRS UPEC, CMTR, ICMPE, 2 Rue Henri Dunant, F-94320 Thiais, France
来源：
CHEMICAL PHYSICS LETTERS | 2017年 / 680卷
关键词：
Perovskite manganites; Relative cooling power; Magnetocaloric effect; Landau theory; PHASE-TRANSITION; LA0.5CA0.5-XAGXMNO3; COMPOUNDS; DY; BEHAVIOR; HO;
D O I：
10.1016/j.cplett.2017.05.041
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：
Magnetic entropy change of Dy-0.5(Sr1-xCax.)(0.5)MnO3 nanoparticles (0 <= x <= 0.3) was analyzed at low temperatures to investigate the magnetic refrigeration as a promising tool for hydrogen liquefaction. These samples depict interesting values of maximum magnetic entropy change and large relative cooling power, especially for x = 0.3 sample (about 169 J/Kg). It could be a promising candidate for magnetic refrigeration at cryogenic temperatures. Landau theory presents a discord between the experimental magnetic entropy change and the theoretical one. This disagreement is tending to be in accordance as Ca substitution is increasing and also with augmenting the applied magnetic field. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：94 / 100
页数：7
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