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  Effect of chemical and external hydrostatic pressure on magnetic and magnetocaloric properties of Pt doped Ni2MnGa shape memory Heusler alloys

Sivaprakash, P., Esakki Muthu, S., Singh, A. K., Dubey, K. K., Kannan, M., Muthukumaran, S., et al. (2020). Effect of chemical and external hydrostatic pressure on magnetic and magnetocaloric properties of Pt doped Ni2MnGa shape memory Heusler alloys. Journal of Magnetism and Magnetic Materials, 514: 167136, pp. 1-7. doi:10.1016/j.jmmm.2020.167136.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A320-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-AB87-1
Genre: Journal Article

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 Creators:
Sivaprakash, P.1, Author
Esakki Muthu, S.1, Author
Singh, Anupam K.1, Author
Dubey, K. K.1, Author
Kannan, M.1, Author
Muthukumaran, S.1, Author
Guha, Shampa1, Author
Kar, Manoranjan1, Author
Singh, Sanjay2, Author              
Arumugam, 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: Heusler alloys, Hydrostatic pressure, Magnetocaloric effect, Martensite transition, Shape Memory alloys, Entropy, Gallium alloys, Hydraulics, Hydrostatic pressure, Manganese alloys, Martensite, Platinum, Pressure effects, Shape memory effect, Ternary alloys, Applied magnetic fields, Effect of chemicals, External hydrostatic pressures, External pressures, Magnetic entropy change, Magnetocaloric effect (MCE), Magnetocaloric properties, Thermal hysteresis, Magnetocaloric effects
 Abstract: The magnetocaloric effect (MCE) on Ni2−xPtxMnGa (x = 0.2, 0.3 and 1.0) shape memory Heusler alloys around martensite phase transition temperature (TM) is investigated by varying chemical pressure (Pt concentration). The magnetic entropy change (ΔSM) decreases with increasing chemical pressure for various external applied magnetic fields up to 3 T, and the width of thermal hysteresis increases with the increases of Pt concentration. The effect of hydrostatic pressure on both TM and ΔSM for Ni1.8Pt0.2MnGa is also investigated. We observed that the application of hydrostatic pressure increases TM (3.5 K/GPa) and stabilizes the martensite phase. The maximum magnetic entropy change (ΔSmax) of 9.31 J Kg−1 K-1is observed for a field change of 9 T at ambient pressure for Ni1.8Pt0.2MnGa. Further, the application of external pressure leads to the decrease of ΔSmax to 5.52 J Kg−1 K−1 at 0.91 GPa. © 2020 Elsevier B.V.

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Language(s): eng - English
 Dates: 2020-06-122020-06-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jmmm.2020.167136
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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: 514 Sequence Number: 167136 Start / End Page: 1 - 7 Identifier: ISSN: 0304-8853
CoNE: https://pure.mpg.de/cone/journals/resource/954925512464