Effect of Fe substitution on magnetocaloric effect in La0.7Sr0.3Mn1-xFexO3 (0.05≤x≤0.20)

被引:99
作者
Barik, S. K.
Krishnamoorthi, C.
Mahendiran, R. [1 ]
机构
[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
关键词
Manganite; Colossal magnetoresistance; Magnetocaloric effect; Magnetic entropy; MAGNETIC-ENTROPY CHANGE; COLOSSAL MAGNETORESISTANCE; ROOM-TEMPERATURE; CU; TRANSITION; FIELD; MN;
D O I
10.1016/j.jmmm.2010.12.007
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the effect of Fe substitution on magnetic and magnetocaloric properties in La0.7Sr0.3Mn1-xFexO3 (x=0.05, 0.07, 0.10, 0.15, and 0.20) over a wide temperature range (T=10-400K). It is shown that substitution by Fe gradually decreases the ferromagnetic Curie temperature (T-C) and saturation magnetization up to x=0.15 but a dramatic change occurs for x=0.2. The x=0.2 sample can be considered as a phase separated compound in which both short-range ordered ferromagnetic and antiferromagnetic phases coexist. The magnetic entropy change (-Delta S-m) was estimated from isothermal magnetization curves and it decreases with increase of Fe content from 4.4 J kg(-1) K-1 at 343 K (x=0.05) to 1.3 J kg(-1) K-1 at 105 K (x=0.2), under Delta H=5 T. The La0.7Sr0.3Mn0.93Fe0.07O3 sample shows negligible hysteresis loss, operating temperature range over 60 K around room temperature with refrigerant capacity of 225 J kg(-1), and magnetic entropy of 4 J kg(-1) K-1 which will be an interesting compound for application in room temperature refrigeration. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:1015 / 1021
页数:7
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