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Microstructural, Magnetic and Electrical Properties of Ni2FeGa Heusler Alloys

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Abstract

Ni2FeGa polycrystalline alloys are synthesized by arc melting into single phase β structure and two phase mixture of γ-phase (fcc) and austenite (L21). Annealing improves atomic ordering and β transforms to L21 ordered structure. Effect of alloy composition and processing condition on different phase formation, microstructural, magnetic and electrical properties are discussed. The alloy undergoes first order austenite to martensitic phase transformation at 225 K with low hysteresis of 10 K. The resistivity exhibits a jump upon martensite transformation. This increase in resistivity is being attributed to the change in effective mass of electron upon martensite transformation. The temperature dependent resistivity curve for both austenite and martensite varies linearly with αT suggesting strong electron–phonon scattering. The slope of temperature dependent resistivity curve is higher in case of austenite than that of martensite and is attributed to the increasing role of electron–phonon scattering at high temperature.

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Acknowledgments

Authors like to thank Prof. P. N. Santosh, Prof. R. Nirmala, Dr. Ganesh Raj and Mr. Rajib Mondal, Department of Physics IIT Madras for their kind help in resistivity measurement.

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  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    Hrusikesh Nath & G. Phanikumar

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  1. Hrusikesh Nath
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  2. G. Phanikumar
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Correspondence to Hrusikesh Nath.

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Nath, H., Phanikumar, G. Microstructural, Magnetic and Electrical Properties of Ni2FeGa Heusler Alloys. Trans Indian Inst Met 69, 1389–1396 (2016). https://doi.org/10.1007/s12666-015-0691-9

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  • DOI: https://doi.org/10.1007/s12666-015-0691-9

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