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An Equation of the State and Surface Properties of Amorphous Iron

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Abstract

It has been shown that three singular points related to an amorphous state can be distinguished in the dependence of the first coordination number kn on packing coefficient kp in the structure of a unicomponent material. The equation of state and properties of iron for both these three amorphous structures and the crystal state are calculated on the basis of the Mie–Lennard-Jones pair interatomic potential. It is shown that the chemical potential becomes minimal at kp = 0.45556 and kn = 6.2793; that is, this packing can be assigned to a thermodynamically stable amorphous structure corresponding to a liquid phase. A point that is energetically equivalent to this phase and has the same value of kn but another value of kp (0.6237) is a thermodynamically unstable amorphous structure corresponding to a solid phase. It was shown that the specific surface energy of an amorphous solid metal is higher than that of the amorphous liquid phase but is lower than the specific surface energy of a crystalline metal. This should lead to the fact that the surface of a crystalline metal will tend to amorphization.

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Notes

  1. Hereafter, approximation by polynomials of different degrees is done by the least-squares method embedded in the Origin graphic plotter.

  2. The value T = 10 K was taken to show how the S-shaped loop varies on the fH(kp) dependence with temperature. At T = 10 K, the liquid phase cannot be in equilibrium with the solid (amorphous or crystalline) one.

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ACKNOWLEDGMENTS

The author thanks S.P. Kramynin, N.Sh. Gazanova, Z.M. Surkhaeva, and M.M. Gadzhieva for fruitful discussions and assistance.

Funding

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

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Authors and Affiliations

  1. Institute of Geothermal Problems and Renewable Energy Sources, Joint Institute for High Temperatures (Branch), Russian Academy of Sciences, 367030, Makhachkala, Russia

    M. N. Magomedov

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Correspondence to M. N. Magomedov.

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Translated by V. Isaakyan

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Magomedov, M.N. An Equation of the State and Surface Properties of Amorphous Iron. Tech. Phys. 65, 1659–1665 (2020). https://doi.org/10.1134/S1063784220100138

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