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Published in: Journal of Materials Science 2/2014

01-01-2014

Mixed-valence La0.80(Ag1−x Sr x )0.20MnO3 manganites with magnetocaloric effect

Authors: M. E. Amano, I. Betancourt, J. L. Sánchez Llamazares, L. Huerta, C. F. Sánchez-Valdés

Published in: Journal of Materials Science | Issue 2/2014

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Abstract

We report the effect of the simultaneous inclusion of Ag1+ and Sr2+ cations on the crystal structure and the magnetocaloric effect (MCE) of La0.80(Ag1−x Sr x )0.20MnO3 manganites (x = 0.0, 0.25, 0.50, 0.75, 1.0) synthesized by the solid-state reaction method. X-ray photoelectron spectroscopy was used to verify chemical composition and the amount of Mn3+–Mn4+ cations, while the magnetic performance was evaluated by means of a Physical Property Measuring System. The progressive substitution of Ag1+ by Sr2+ causes the increase of the number of Mn4+ cations, together with increasing ionic radii for the A-site contents up to x = 0.75, both favoring the enhancement of the double-exchange interaction and hence, the MCE. Excellent values of magnetic entropy change (−4.6 J/kg K, μ oΔH = 5.0 T) were observed for the x = 0.25 manganite, while for the x = 0.50 sample interesting refrigerant capacity (129 J/kg, μ oΔH = 2.0 T) and a wide interval of temperature at the full-width at half maximum δT FWHM of the magnetic entropy change curve were recorded (101 K, μ oΔH = 2.0 T) caused by two successive magnetic transitions. Magnetic performance was explained in terms of the effect of the cation substitution on the double-exchange interaction and the tolerance factor.

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Metadata
Title
Mixed-valence La0.80(Ag1−x Sr x )0.20MnO3 manganites with magnetocaloric effect
Authors
M. E. Amano
I. Betancourt
J. L. Sánchez Llamazares
L. Huerta
C. F. Sánchez-Valdés
Publication date
01-01-2014
Publisher
Springer US
Published in
Journal of Materials Science / Issue 2/2014
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-013-7743-5

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