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  Improved crystallographic compatibility and magnetocaloric reversibility in Pt substituted Ni2Mn1.4In0.6 magnetic shape memory Heusler alloy

Dubey, K., Devi, P., Singh, A., & Singh, S. (2020). Improved crystallographic compatibility and magnetocaloric reversibility in Pt substituted Ni2Mn1.4In0.6 magnetic shape memory Heusler alloy. Journal of Magnetism and Magnetic Materials, 507: 166818, pp. 1-7. doi:10.1016/j.jmmm.2020.166818.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-38CF-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-38D2-E
Genre: Journal Article

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 Creators:
Dubey, K.K.1, Author
Devi, P.2, Author              
Singh, A.K.1, Author
Singh, S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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Free keywords: Alloying, Austenite, Eigenvalues and eigenfunctions, Entropy, Hysteresis, Indium alloys, Isotherms, Linear transformations, Magnetic shape memory, Manganese alloys, Martensite, Platinum, Shape-memory alloy, Ternary alloys, Compatibility conditions, Different protocols, Isothermal entropy change, Magnetic entropy change, Magnetization curves, Magnetocaloric effect (MCE), Measurement protocol, Transformation matrices, Magnetocaloric effects
 Abstract: We present here the improved crystallographic/geometric compatibility and magnetocaloric reversibility by measurement of magnetic entropy change using different protocols in 10% Pt substituted Ni2Mn1.4In0.6 magnetic shape memory alloy. The substitution of Pt reduces the thermal hysteresis about 50% to the Ni2Mn1.4In0.6. The origin of the reduced thermal hysteresis is investigated by the crystallographic compatibility of the austenite and martensite phases. The calculated middle eigenvalue of the transformation matrix turned out to be 0.9982, which is very close to 1 (deviation is only 0.18%) suggests for the crystallographic compatibility between the austenite and martensite phases in Ni1.9Pt0.1Mn1.4In0.6. A very small thermal hysteresis and crystallographic compatibility between two phases in this alloy system indicate a stress-free transition layer (i.e. perfect habit plane) between the austenite and martensite phase, which is expected to give reversible martensite phase transition and therefore reversible magnetocaloric effect (MCE) as well. The calculated value of the isothermal entropy change (ΔSiso) using the magnetization curve under three different measurement protocols (i.e. isothermal, loop, and isofield measurement protocol) is found to be nearly same indicating a reversible MCE in the present alloy system. Our work provides a path to design new magnetic shape memory Heusler alloys for magnetic refrigeration and also suggest that any of the above measurement protocol can be used for the calculation of ΔSiso for materials satisfying geometrical compatibility condition. © 2020 Elsevier B.V.

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Language(s): eng - English
 Dates: 2020-03-272020-03-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.jmmm.2020.166818
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Title: Journal of Magnetism and Magnetic Materials
  Other : Journal of Magnetism and Magnetic Materials: MMM
  Abbreviation : J. Magn. Magn. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : NH, Elsevier
Pages: - Volume / Issue: 507 Sequence Number: 166818 Start / End Page: 1 - 7 Identifier: ISSN: 0304-8853
CoNE: https://pure.mpg.de/cone/journals/resource/954925512464