Magnetostructural transitions and adiabatic temperature variation in polycrystal and single-crystal Ni2MnGa alloys

Date
2006-04-19
Authors
Sasso, C.
Pasquale, M.
Giudici, L.
Besseghini, S.
Villa, E.
Lewis, L.
Lograsso, Thomas
Schlagel, Deborah
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Ames Laboratory
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Abstract

The magnetocaloric response of off-stoichiometric Ni2MnGa polycrystal and single-crystal samples with a Curie temperature coincident with the martensitic transition temperature was investigated. The direct measurement of temperature change (ΔTad) during an adiabatic transformation under a maximum field variation ΔH = 5.6×106 A/m (7 T) was performed. The polycrystalline sample shows a maximum ΔTad ≈ 1.5 K at a temperature close to the structural transition. The value of ΔTad and the 20 K span of the ΔTad peak encourage further studies of the effect of microstructure on the magnetocaloric response of Ni2MnGa.

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Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Journal of Applied Physics 99 (2006): 08K905 and may be found at http://dx.doi.org/10.1063/1.2162335.

Keywords
nickel alloys, manganese alloys, gallium alloys, Curie temperature, magnetocaloric effects, martensitic transformations, crystal microstructure
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