Barocaloric and magnetocaloric effects in (MnNiSi)1-x(FeCoGe)x
- Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
- Polytechnic Univ. of Catalonia, Barcelona (Spain). Dept. of Physics. Barcelona Research Center in Multiscale Science and Engineering
- Southern Illinois Univ., Carbondale, IL (United States). Dept. of Physics
(MnNiSi)1-x(FeCoGe)x undergoes a magnetostructural phase transition near room temperature that is acutely sensitive to applied hydrostatic pressure, which presents as a marked shift in the martensitic transition temperature (TM) by about –7.5 K/kbar. The magnetostructural transition can therefore be induced by applied hydrostatic pressure or by magnetic field. The barocaloric and magnetocaloric effects were measured across TM (for the sample with x = 0.38), and the corresponding entropy changes were +74 J/kg K (P = 2.7 kbar) and –58 J/kg K (μ0 H = 5 T), respectively. It was observed here that the transition entropy change increases with pressure, which results in an enhancement of the barocaloric effect. Our measurements show that the transformed phase fraction associated with magnetostructural transition does not depend on pressure and, therefore, this enhancement cannot be attributed to a pressure-assisted completion of the phase transformation.
- Research Organization:
- Southern Illinois Univ., Carbondale, IL (United States); Louisiana State Univ., Baton Rouge, LA (United States); Polytechnic Univ. of Catalonia, Barcelona (Spain)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Interministerial Commission of Science and Technology (CICYT) (Spain); Catalan Government; USDOE
- Grant/Contract Number:
- FG02-06ER46291; FG02-13ER46946; FG02-07ER46420; SC0010521; 1306392; FIS2014-54734-P; 2014SGR-00581
- OSTI ID:
- 1510947
- Alternate ID(s):
- OSTI ID: 1416647; OSTI ID: 1872898
- Journal Information:
- Applied Physics Letters, Vol. 112, Issue 2; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
magnetism
hydrostatics
chemical elements
thermodynamic measurements and instrumentation
phase transitions
thermodynamic properties
entropy
ferromagnetic materials
thermodynamic states and processes
thermal instruments
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
barocaloric effect
magnetocaloric effect