Large adiabatic temperature change in magnetoelastic transition in Ni{sub 50}Mn{sub 35}Cr{sub 2}Sn{sub 13} Heusler alloy of granular nanostructure

The Ni-Mn-Sn alloys are a pioneering series of magnetocaloric materials of a huge heat-energy exchanger in the martensite transition. A small additive of nearly 2 at% Cr effectively tunes the valence electron density of 8.090 electrons per atom and a large change in the entropy ΔS{sub M←A} = 4.428 J...

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Bibliographic Details
Published in:AIP conference proceedings 2016-05, Vol.1728 (1)
Main Authors: Prakash, H. R., Sharma, S. K., Ram, S., Chatterjee, S.
Format: Article
Language:English
Subjects:
ADDITIVES
ASPECT RATIO
AUSTENITE
COERCIVE FORCE
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON DENSITY
ENTROPY
HEAT
HEUSLER ALLOYS
HYSTERESIS
MAGNETIZATION
MANGANESE COMPOUNDS
MARTENSITE
NANOSTRUCTURES
NICKEL COMPOUNDS
PHASE TRANSFORMATIONS
SATURATION
TERNARY ALLOY SYSTEMS
TIN COMPOUNDS
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Summary:The Ni-Mn-Sn alloys are a pioneering series of magnetocaloric materials of a huge heat-energy exchanger in the martensite transition. A small additive of nearly 2 at% Cr effectively tunes the valence electron density of 8.090 electrons per atom and a large change in the entropy ΔS{sub M←A} = 4.428 J/kg-K (ΔS{sub M→A} = 3.695 J/kg-K in the recycle) at the martensite ← austenite phase transition as it is useful for the magnetic refrigeration and other cooling devices. The Cr additive tempers the tetragonality with the aspect ratio c/a = 0.903 of the martensite phase and exhibits an adiabatic temperature change of 10 K. At room temperature, a hysteresis loop exhibits 48.91 emu/g saturation magnetization and 82.1 Oe coercivity.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4946533