Miedema’s model – Knowledge and References

Miedema's model

Miedema's model is a semi-empirical method used to estimate the Gibbs energy of formation of binary compounds, which takes into account the electron density, mole volume, gas constant, temperature, and materials' constants such as electronegativity and electron density. It is used when experimental data on activity coefficients in infinite diluted solutions are limited. Ternary phases and solid solubilities are disregarded in this model.From: Ternary Alloys Based on III-V Semiconductors [2017], Development of alloy coatings by electron beam physical vapour deposition method [2021]

Systems Based on AlAs

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Published in Tomashyk Vasyl, Ternary Alloys Based on III-V Semiconductors, 2017

Tomashyk Vasyl

The isothermal section of the Al–Ag–As ternary system at room temperature was approximately calculated (Klingbeil and Schmid-Fetzer 1989). The calculations are based on the following approximations: ternary phases and solid solubility are disregarded and the Gibbs energy of formation of binary compounds is mostly estimated by the enthalpy of formation calculated from Miedema’s model. At room temperature, AlAs is in thermodynamic equilibrium with Ag, Ag3Al, and Ag2Al.

Critical evaluation and thermodynamic CALPHAD reassessment of Cerium–Nickel system

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Published in Canadian Metallurgical Quarterly, 2023

Z. Rahou, D. Moustaine, Y. Ben-Ali, A. Hallaoui

Earlier, the enthalpies of formation of all intermetallic compounds in the Ce–Ni system are estimated using modified Miedema model by Niessen et al. [37]: Ce7Ni3, −25.0; CeNi, −39.9; CeNi2, −41.1; CeNi3, −34.8; Ce2Ni7, −31.7; and CeNi5, −24.4 in kJ (mol at)−1. However, it should be emphasised that the enthalpies of formation predicted by this model [37] are mostly more exothermic than the experimental results.

Miedema's model

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Systems Based on AlAs

Critical evaluation and thermodynamic CALPHAD reassessment of Cerium–Nickel system