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- W2041620003 abstract "A lattice gas with random-site energies is investigated as a model for hydrogen in amorphous metals. The author's recent theory for calculating the chemical potential in a system with many competing interactions is modified to include the random-site energies. Results are qualitatively different from those recently presented by Griessen using simple mean-field (MF) theory. Whereas MF theory predicts no phase separation above a critical value of the site energy width $ensuremath{Delta}$, the present model gives a finite critical temperature $frac{{T}_{c}ensuremath{alpha}1}{ensuremath{Delta}}$ for large $ensuremath{Delta}$. It also predicts the critical concentration to decrease proportionally to $frac{1}{{ensuremath{Delta}}^{2}}$ and yields a closed-loop, retrograde-solubility phase diagram. Thus, analogous to binary liquids with orientation-dependent interactions, there is a maximum concentration above which no phase separation occurs. For interactions and spread in site energy expected for Pd-based amorphous hydrides, the critical temperature is predicted to be approximately 200---250 K, which may be detectable by heat-capacity or spectroscopic techniques even if it is too low for pressure-versus-composition studies." @default.
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- W2041620003 date "1984-11-01" @default.
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- W2041620003 title "Lattice gas with random-site energies and theory of novel amorphous metal hydride phase" @default.
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- W2041620003 doi "https://doi.org/10.1103/physrevb.30.5183" @default.
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