Room temperature inverse magnetocaloric effect in Pd substituted Ni sub(50)Mn sub(37)Sn sub( 13) Heusler alloys

The structural, magnetic and magnetocaloric effects for Ni sub(50-)xd sub() xn sub(37)Sn sub(13) Heusler alloys have been investigated around both structural and magnetic transitions. The room temperature X-ray diffraction indicates 10 M modulated martensitic structure with an orthorhombic unit cell...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 448; pp. 263 - 266
Main Authors Saha, Ritwik, Nigam, A K
Format Journal Article
LanguageEnglish
Published 01.09.2014
Subjects
Condensed matter
Diffraction
Entropy
Heusler alloys
Inverse
Maximum entropy
Palladium
Superstructures
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Summary:The structural, magnetic and magnetocaloric effects for Ni sub(50-)xd sub() xn sub(37)Sn sub(13) Heusler alloys have been investigated around both structural and magnetic transitions. The room temperature X-ray diffraction indicates 10 M modulated martensitic structure with an orthorhombic unit cell for x = 0 and 1. However, the superstructure reflections for x = 2 alloy imply that the pattern is related to the L2 sub(1) phase. The maximum entropy change occurring at the martensitic transition is found to be 21 J kg super(-1) K super(-1) for Ni sub(50)Mn sub(37)Sn sub( 13) alloy around room temperature. Despite the smaller change in entropy around room temperature, 3.8 times larger value of refrigerant capacity (184.6 J/kg) is achieved for 2% substitution of Pd, due to occurrence of magnetic entropy change in a broader temperature region.
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ISSN:0921-4526
DOI:10.1016/j.physb.2014.04.011