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Title: Effect of Fe substitution on magnetocaloric effect in La 0.7Sr0.3Mn1-xFexO3 (0.05≤x≤0.20)
Authors: Barik, S.K. 
Krishnamoorthi, C. 
Mahendiran, R. 
Keywords: Colossal magnetoresistance
Magnetic entropy
Magnetocaloric effect
Issue Date: Apr-2011
Source: Barik, S.K., Krishnamoorthi, C., Mahendiran, R. (2011-04). Effect of Fe substitution on magnetocaloric effect in La 0.7Sr0.3Mn1-xFexO3 (0.05≤x≤0.20). Journal of Magnetism and Magnetic Materials 323 (7) : 1015-1021. ScholarBank@NUS Repository.
Abstract: We have studied the effect of Fe substitution on magnetic and magnetocaloric properties in La0.7Sr0.3Mn 1-xFexO3 (x=0.05, 0.07, 0.10, 0.15, and 0.20) over a wide temperature range (T=10400 K). It is shown that substitution by Fe gradually decreases the ferromagnetic Curie temperature (TC) 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 (-ΔSm) 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 ΔH=5 T. The La0.7Sr 0.3Mn0.93Fe0.07O3 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. © 2010 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/j.jmmm.2010.12.007
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