Enhancement of refrigeration capacity and table-like magnetocaloric effect in La0.8Ca0.2MnO3/La0.8K0.2MnO3 nanocrystalline composite

被引：36
作者：
Wang, G. F. [1 ]
Zhao, Z. R. [1 ,2 ]
Li, H. L. [2 ]
Zhang, X. F. [1 ,2 ]
机构：
[1] Inner Mongolia Univ Sci & Technol, Key Lab Integrated Exploitat Bayan Obo Multimet R, Baotou 014010, Peoples R China
[2] Inner Mongolia Univ Sci & Technol, Sch Math Phys & Biol Engn, Baotou 014010, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2015年 / 41卷 / 07期
关键词：
B; Composite; Magnetocaloric effect; Refrigeration capacity; MAGNETIC ENTROPY CHANGE;
D O I：
10.1016/j.ceramint.2015.03.275
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this paper we report on the magnetocaloric effect and refrigeration capacity (RC) of La0.8Ca0.2MnO3(LCMO)/La0.8K0.2MnO3(LKMO) composite with a mass fraction of 1:1. X-ray diffraction patterns indicate that the component manganites crystalin in the same rhombohedral structure. The LCMO and LKMO undergo second-order phase transitions at 247 K and 281 K, respectively. The maximum values of isothermal entropy change (-Delta S-T,S-max) are found to be 4.25 J/kg K and 3.71 J/kg K under a magnetic field change of 5 T for LCMO and LKMO, respectively. The composite exhibits a table-like Delta S-T curve with slightly lowered peak value. An enhancement of 33%-35% for RC has been found in the composite when comparing with those of the components. It reveals that the combination of magnetocaloric materials with different Curie temperatures is a possible method for improving RC. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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收藏
页码：9035 / 9040
页数：6
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