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arXiv · 2302.00460

Explaining the Entropy Forming Ability with the atomic size mismatch

Andreas Kretschmer·Paul Heinz Mayrhofer
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Abstract

To quickly screen for single-phased multi-principal-element materials, a so-called entropy forming ability (EFA) parameter is sometimes used as a descriptor. The higher the EFA, the higher is the propensity to form a single-phase structure, which is stabilized against separation up to a certain threshold by the configurational entropy. We have investigated this EFA descriptor with atomic relaxations in special-quasi-random structures and discovered that the EFA correlates inversely with the lattice distortion. Large atomic size differences lead to multi-phase compounds, and little size differences to single-phase compounds. Instead of configurational entropy, we therefore demonstrate the applicability of the Hume-Rothery rules to phase stability of solid solutions even in compositionally complex ceramics.

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Andreas Kretschmer, Paul Heinz Mayrhofer. 2023-02-01. Explaining the Entropy Forming Ability with the atomic size mismatch. https://arxiv.org/abs/2302.00460

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