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On Deviations from Vegard’s Law at Increasing Pressure in Alloys

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Abstract

A method has been proposed for calculating the lattice parameter of binary substitutional solid solutions, which takes into account the presence of pressure (p) in alloys. The method has been applied to SiGe and CuAu alloys. It has been shown that, at p = 0, the deviation from Vegard’s law (Δl) results from the difference in compressibility and atomic volume between the pure constituent components of the alloys. With increasing pressure, Δl increases. According to our calculations, the Δl(p) of SiGe becomes positive at p0 = 0.685 GPa.

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ACKNOWLEDGMENTS

I am grateful to S.P. Kramynin, N.Sh. Gazanova, and Z.M. Surkhaeva for their assistance with this study and useful discussions.

Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-29-11013_mk) and the Presidium of the Russian Academy of Sciences (program no. 6, grant no. 2-13).

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Authors and Affiliations

  1. Institute for Geothermal Research, Dagestan Scientific Center, Russian Academy of Sciences, 367030, Makhachkala, Dagestan, Russia

    M. N. Magomedov

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Correspondence to M. N. Magomedov.

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Magomedov, M.N. On Deviations from Vegard’s Law at Increasing Pressure in Alloys. Inorg Mater 56, 903–908 (2020). https://doi.org/10.1134/S0020168520090125

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