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Magnetic and structural phase transitions in the shape-memory ferromagnetic alloys Ni2+x Mn1−x Ga

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Abstract

The results of an experimental investigation of the temperature dependences of the magnetic susceptibility and resistivity in the shape-memory ferromagnetic alloys Ni2+x Mn1−x Ga (x=0–0.20) are reported. A T−x phase diagram is constructed on the basis of these data. It is shown that partial substitution of Ni for Mn causes the temperatures of the structural (martensitic) T M and magnetic T C (Curie point) phase transitions to converge. In the region where T C =T M the transition temperature increases linearly with magnetic field in the range from 0 to 10 kOe. The kinetics of a magnetic-field-induced martensitic phase transition is investigated, and the velocities of the martensite-austenite interphase boundary during direct and reverse transitions are measured. A theoretical model is proposed and the T−x phase diagram is calculated. It is shown that there exist concentration ranges where the magnetic and martensitic transitions merge into a first-order phase transition. The theoretical results are in qualitative agreement with experiment.

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Authors and Affiliations

  1. M. V. Lomonosov Moscow State University, 119899, Moscow, Russia

    A. D. Bozhko, A. N. Vasil’ev & V. V. Khovailo

  2. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 103907, Moscow, Russia

    I. E. Dikshtein, V. V. Koledov, S. M. Seletskii, A. A. Tulaikova, A. A. Cherechukin & V. G. Shavrov

  3. Chelyabinsk State University, 454021, Chelyabinsk, Russia

    V. D. Buchel’nikov

Authors
  1. A. D. Bozhko
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  2. A. N. Vasil’ev
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  3. V. V. Khovailo
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  4. I. E. Dikshtein
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  5. V. V. Koledov
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  6. S. M. Seletskii
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  7. A. A. Tulaikova
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  8. A. A. Cherechukin
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  9. V. G. Shavrov
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  10. V. D. Buchel’nikov
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Additional information

Zh. Éksp. Teor. Fiz. 115, 1740–1755 (May 1999)

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Bozhko, A.D., Vasil’ev, A.N., Khovailo, V.V. et al. Magnetic and structural phase transitions in the shape-memory ferromagnetic alloys Ni2+x Mn1−x Ga. J. Exp. Theor. Phys. 88, 954–962 (1999). https://doi.org/10.1134/1.558877

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  • DOI: https://doi.org/10.1134/1.558877

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