Abstract
Solubility data of hydrogen, nitrogen and carbon in α-iron are analysed on the basis of statistical thermodynamics. Present analysis appears to yield realistic values for the enthalpy term of the solutions of these interstitial elements into α-Fe, while the entropy terms remain ambiguous. During the course of this analysis a parameter θ x, which refers to the solubility limit of the specific interstitial element X (X=hydrogen, nitrogen or carbon), is also estimated; θ H< θ N< θ C. This order of θ X values appears to be in accord with the observation that, under normal conditions, the solubility of carbon is the highest and that of hydrogen the lowest in α-Fe, while the atomic size increases with the order hydrogen<nitrogen<carbon.
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