Large adiabatic temperature change in magnetoelastic transition in Ni50Mn35Cr2Sn13 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 M←A = 4.428 J/kg-K...

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Bibliographic Details
Main Authors: Prakash, H. R., Sharma, S. K., Ram, S., Chatterjee, S.
Format: Conference Proceeding
Language:English
Subjects:
Adiabatic flow
Aspect ratio
Coercivity
Electron density
Heusler alloys
Hysteresis loops
Magnetic materials
Magnetic saturation
Manganese
Martensite
Nickel base alloys
Phase transitions
Refrigeration
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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 M←A = 4.428 J/kg-K (ΔS 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 82.1Oe coercivity.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4946533