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Erschienen in: Journal of Materials Science 5/2018

13.11.2017 | Energy materials

Magnetocaloric effect in Mn1−x CoGeSi x alloys

verfasst von: Xiaodong Si, Yongsheng Liu, Yulong Shen, Wenying Yu, Xinxiu Ma, Zhanxian Zhang, Yan Xu, Tian Gao

Erschienen in: Journal of Materials Science | Ausgabe 5/2018

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Abstract

A comprehensive study of the magnetic transition, magnetocaloric effect, critical behavior, and universal behavior for Mn1−x CoGeSi x (x = 0.02, 0.04, 0.06, and 0.08) system is reported. The Curie temperature increases from 270 to 289 K as the Si doping increases, while the maximum magnetic entropy change (|ΔS M|) decreases from 3.08 to 2.67 J/kg K (5 T), consistent with the shift of magnetic moment. Various techniques are used to determine the critical exponents and confirm the validity of the obtained critical exponents, revealing long-range interactions in this system. The Landau theory and universal behavior are used to evidence the second-order nature of the transition. Moreover, the new method to estimate the spontaneous magnetization estimated from the magnetic entropy change is verified.

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Metadaten
Titel
Magnetocaloric effect in Mn1−x CoGeSi x alloys
verfasst von
Xiaodong Si
Yongsheng Liu
Yulong Shen
Wenying Yu
Xinxiu Ma
Zhanxian Zhang
Yan Xu
Tian Gao
Publikationsdatum
13.11.2017
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 5/2018
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-1783-1

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