Effect of nanocrystalline structure on magnetocaloric effect in manganite composites (1/3)La0.7Ca0.3MnO3/(2/3)La0.8Sr0.2MnO3

被引：17
作者：
Pekala, M. [1 ]
Pekala, K. [2 ]
Drozd, V. [3 ]
Fagnard, J. -F. [4 ]
Vanderbemden, P. [4 ]
机构：
[1] Univ Warsaw, Dept Chem, PL-02089 Warsaw, Poland
[2] Tech Univ Warsaw, Fac Phys, PL-00662 Warsaw, Poland
[3] Florida Int Univ, Ctr Study Matter Extreme Condit, Miami, FL 33199 USA
[4] Univ Liege, SUPRATECS, Dept Elect Engn & Comp Sci B28, B-4000 Liege, Belgium
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 629卷
关键词：
Composite materials; Nanocrystalline manganites; Magnetocaloric effect; Magnetic refrigeration; Phase transitions;
D O I：
10.1016/j.jallcom.2014.12.216
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：
Poly- and nanocrystalline manganite composites (1/3)La0.7Ca0.3MnO3/(2/3)La0.8Sr0.2MnO3 prepared by the sol-gel method are studied by magnetic and transport measurements. The Arrott plots and universal curve of magnetic entropy change confirm that magnetic transition is of the second order. The magnetocaloric effect of polycrystalline composite is found to be roughly twice smaller as compared to the polycrystalline Ca- and Sr-based parent phases. The nanocrystalline composite of the same composition exhibits only 8% reduction of magnetic entropy change. Due to the large temperature spread of magnetocaloric effect the relative cooling power RCP of nanocrystalline composite is about three times larger as compared to the nanocrystalline Ca- and Sr-based parent phases. The maximum magnetic entropy change DSMAX and relative cooling power RCP are found to be more sensitive to magnetic field strength for the nano-than for polycrystalline composites studied. (C) 2015 Elsevier B.V. All rights reserved.
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收藏
页码：98 / 104
页数：7
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