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Effect of Co substitution on the martensitic transformation and magnetocaloric properties of Ni50Mn35−xCoxSn15

Published online by Cambridge University Press:  23 April 2013

F.S. Liu ,
Q.B. Wang ,
S.P. Li ,
W.Q. Ao  and
J.Q. Li
F.S. Liu
Affiliation:
College of Materials Science and Engineering, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
Q.B. Wang
Affiliation:
College of Materials Science and Engineering, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
S.P. Li
Affiliation:
College of Materials Science and Engineering, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
W.Q. Ao
Affiliation:
College of Materials Science and Engineering, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
J.Q. Li*
Affiliation:
College of Materials Science and Engineering, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
*
a)Author to whom correspondence should be addressed. Electronic mail: junqinli@szu.edu.cn
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Abstract

Martensitic transformation and magnetic entropy change in Co substituted Ni50Mn35−xCoxSn15 (x = 0, 1.0, 1.5, 2.0, and 3.0) Heusler alloys have been investigated by X-ray powder diffraction analysis, differential scanning calorimetry, and magnetic measurements. X-ray diffraction analysis reveals that the Ni50Mn35−xCoxSn15 alloys have L21 Heusler structure at room temperature. The phase decomposition of the sample with x = 3.0, after annealing 48 h at 1173 K, is confirmed by both X-ray powder diffraction analysis and energy-dispersive x-ray spectroscopy in scanning electron microscopy. With the increase of the Co content from 0 to 2.0, the martensitic transformation temperature TM increases from 185 to 245 K, which is in good agreement with the rule of valence electron concentration e/a-dependence of TM. The magnetic entropy change ∆SM is investigated in the vicinity of the martensitic transformation.

Keywords

Heusler alloysmartensitic transformationmagnetocaloric effect
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S1 , September 2013 , pp. S22 - S27
Copyright
Copyright © International Centre for Diffraction Data 2013 

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