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
- High Magnetic Field Lab, UGC-DAE Consortium of Scientific Research, Kolkata-700098 (India)
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.
- OSTI ID:
- 22606541
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1728; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADDITIVES
ASPECT RATIO
AUSTENITE
COERCIVE FORCE
ELECTRON DENSITY
ENTROPY
HEAT
HEUSLER ALLOYS
HYSTERESIS
MAGNETIZATION
MANGANESE COMPOUNDS
MARTENSITE
NANOSTRUCTURES
NICKEL COMPOUNDS
PHASE TRANSFORMATIONS
SATURATION
TERNARY ALLOY SYSTEMS
TIN COMPOUNDS