The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys

Czaja, Paweł; Chulist, Robert; Żywczak, Antoni; Hawelek, Lukasz; Przewoźnik, Janusz

doi:10.3390/magnetochemistry3030024

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The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys

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Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Krakow, Poland

AGH University of Science and Technology, Academic Centre of Materials and Nanotechnology, Al. Mickiewicza 30, 30-059 Kraków, Poland

Institute of Non-Ferrous Metals, 5 Sowinskiego Str., 44-100 Gliwice, Poland

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Department of Solid State Physics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

Author to whom correspondence should be addressed.

Magnetochemistry 2017, 3(3), 24; https://doi.org/10.3390/magnetochemistry3030024

Received: 11 April 2017 / Revised: 18 June 2017 / Accepted: 29 June 2017 / Published: 6 July 2017

(This article belongs to the Special Issue Magnetocaloric and Electrocaloric Materials for Solid State Refrigeration)

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Abstract

Two Ni–Mn–Sn alloys substituted with 0.5 and 1 at.% Cr have been studied. The first alloy shows an average composition of Ni_49.6Mn_37.3Cr_0.7Sn_12.4 (e/a = 8.107), whereas the second has a multiphase microstructure with the matrix phase of an average Ni_52.4Mn_32.7Cr₁Sn₁₄ composition (e/a = 8.146). Both alloys undergo a reversible martensitic phase transformation. The Ni_49.6Mn_37.3Cr_0.7Sn_12.4 alloy transforms to the martensite phase at 239 K and, under the magnetic field change of μ₀·ΔH = 1.5 T, gives the magnetic entropy change equal to 7.6 J/kg·K. This amounts to a refrigerant capacity in the order of 48.6 J/kg, reducible by 29.8% due to hysteresis loss. On the other hand, the alloy with a multiphase microstructure undergoes the martensitic phase transformation at 223 K with the magnetic entropy change of 1.7 J/kg·K (1 T). Although the latter spreads over a broader temperature window in the multiphase alloy, it gives much smaller refrigerant capacity of 16.2 J/kg when compared to Ni_49.6Mn_37.3Cr_0.7Sn_12.4. The average hysteresis loss for a field change of 1.5 T in the multiphase alloy is 2.7 J/kg, reducing the effective refrigerant capacity by 16.7%. These results illustrate that the key to gaining a large effective refrigerant capacity is the synergy between the magnitude of the magnetic entropy change and its broad temperature dependence. View Full-Text

Keywords: magnetocaloric effect; Heusler alloys; martensitic transformation; Vibrating Sample Magnetometer

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Czaja, P.; Chulist, R.; Żywczak, A.; Hawelek, L.; Przewoźnik, J. The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys. Magnetochemistry 2017, 3, 24. https://doi.org/10.3390/magnetochemistry3030024

AMA Style

Czaja P, Chulist R, Żywczak A, Hawelek L, Przewoźnik J. The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys. Magnetochemistry. 2017; 3(3):24. https://doi.org/10.3390/magnetochemistry3030024

Chicago/Turabian Style

Czaja, Paweł, Robert Chulist, Antoni Żywczak, Lukasz Hawelek, and Janusz Przewoźnik. 2017. "The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys" Magnetochemistry 3, no. 3: 24. https://doi.org/10.3390/magnetochemistry3030024

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The Effect of a Multiphase Microstructure on the Inverse Magnetocaloric Effect in Ni–Mn–Cr–Sn Metamagnetic Heusler Alloys

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