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Ab Initio Studies of Phase Transformations in Fe100 – xSix

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Abstract

A concentration phase diagram for Fe100 – xSix (9.375 ≤ x ≤ 25.0 at %) alloys has been built on the base of the structural and magnetic phase transition temperatures estimated theoretically from the first principles. The structural phase transition temperatures for the experimentally observed crystal structures are obtained from the geometric optimization of the crystal structure. The Curie temperatures are estimated in a molecular field approximation using the constants of magnetic exchange interaction calculated ab initio. As temperature increases, the structural transitions from the ordered cubic phase to a completely disordered structure occur via a partially disordered structure over the entire concentration range. As for the magnetic transformations, the ferromagnet–paramagnet transition is observed for all the compositions, but in various crystal phases.

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Funding

This work was supported by the Russian Science Foundation, project no. 18-12-00283.

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Authors and Affiliations

  1. Chelyabinsk State University, Chelyabinsk, Russia

    M. A. Zagrebin, M. V. Matyunina, A. B. Koshkin, V. D. Buchelnikov & V. V. Sokolovskiy

  2. National Research University South Ural State University, Chelyabinsk, Russia

    M. A. Zagrebin

Authors
  1. M. A. Zagrebin
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  2. M. V. Matyunina
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  3. A. B. Koshkin
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  4. V. D. Buchelnikov
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  5. V. V. Sokolovskiy
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Corresponding author

Correspondence to M. A. Zagrebin.

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The authors declare that they have no conflicts of interest.

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Translated by Yu. Ryzhkov

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Zagrebin, M.A., Matyunina, M.V., Koshkin, A.B. et al. Ab Initio Studies of Phase Transformations in Fe100 – xSix. Phys. Solid State 62, 739–743 (2020). https://doi.org/10.1134/S1063783420050327

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