Landau theory for the phase transitions of interstitial hydrogen in strained vanadium

• A special version of the Landau theory of phase transitions has been developed, capturing the order-disorder phase transition in the bulk and elastically strained vanadium-hydrogen system. The equations for the solubility isotherms are obtained and the influence of biaxial strain on the critical temperature is determined. The critical temperature is found to change exponentially with strain. The calculated solubility isotherms agree well with experimental data for temperatures below, as well as above, the critical temperature. The influence of elastic strain on the solubility isotherm is analyzed and noticeable deviations from Sieverts' law, even at the extremely low concentrations, are obtained.

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