Mössbauer study of the martensitic transformation in a Ni–Fe–Ga shape memory alloy |
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| Authors: | J Gutiérrez P Lázpita J M Barandiarán J S Garitaonandia F Plazaola E Legarra V A Chernenko T Kanomata |
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| Institution: | (1) Departamento de Electricidad y Electrónica, Fac. Ciencia y Tecnología, Universidad del País Vasco/EHU, P.Box 644, E-48080 Bilbao, Spain;(2) Departamento de Física Aplicada II, Fac. Ciencia y Tecnología, Universidad del País Vasco/EHU, P.Box 644, E-48080 Bilbao, Spain;(3) Institute of Magnetism, Kyiv, 03142, Ukraine;(4) Department of Applied Physics and Informatics, Tohoku Gakuin University, Sendai 985-8537, Japan |
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| Abstract: | We present the results of an extensive Mössbauer study of the magnetic and martensitic transformation at room temperature of a polycrystalline alloy with a Ni55Fe19Ga26 nominal composition. From calorimetric measurements, we have determined the martensitic transformation temperature of T M ≈ 240 K, in good agreement with the one obtained by magnetic characterization. This sample has a Curie temperature of T C ≈ 287 K. Additional Curie temperatures, belonging to a γ phase, have been also detected. Mössbauer spectroscopy performed at different temperatures monitored all these transformations and the fitting of the obtained spectrum at the highest temperature allow us to give percentages of the different phases in the sample. |
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| Keywords: | ferromagnetic shape memory alloys martensitic transformation M?ssbauer spectroscopy |
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