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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 5/2017

13-04-2017

Tuning Magnetocaloric Effect to Near-Room Temperature for MnCo1−x Ge0.5Si0.5 Alloys

Authors: J. W. Lai, Z. G. Zheng, H. Y. Yu, D. C. Zeng, F. M. Xiao, T. Sun, R. H. Tang

Published in: Journal of Materials Engineering and Performance | Issue 5/2017

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Abstract

The near-room-temperature magnetocaloric materials, i.e., non-stoichiometric MnCo1−x Ge0.5Si0.5 (x = 0, 0.025, 0.050, 0.075, and 0.100) alloys with Co atom vacancies, were investigated. The crystal lattice parameters increased as the Co content decreased. The Curie temperatures decreased from high-temperature (393 K) to near-room-temperature (320 K) values as x increased from 0 to 0.100. In an applied magnetic field of 0 to 2 T, the maximum isothermal magnetic entropy change (|ΔS M|) for the MnCo1−x Ge0.5Si0.5 alloys was 1.5, 1.7, 2.1, 1.7, and 1.9 J/kg K, while the refrigeration capacity (RC) was 46, 62, 62, 62, and 74 J/kg for x = 0, 0.025, 0.050, 0.075, and 0.100, respectively. Thus, a 27% increase in |ΔS M| and a 60% increase in RC are observed for x = 0.100.
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Metadata
Title
Tuning Magnetocaloric Effect to Near-Room Temperature for MnCo1−x Ge0.5Si0.5 Alloys
Authors
J. W. Lai
Z. G. Zheng
H. Y. Yu
D. C. Zeng
F. M. Xiao
T. Sun
R. H. Tang
Publication date
13-04-2017
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 5/2017
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-017-2617-7

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