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A Statistical-mechanical method to evaluate hydrogen solubility in metal

Ogawa, Hiroaki  

I propose a site-occupying model for hydrogen solution in metal because there is a logical discrepancy between the concept of conventional site-blocking models and an experimental fact. This model is based on the experimental fact that hydrogen atoms in metal cannot mutually come closer to less than about 0.21nm each other under hydrogen pressure of 1MPa or less. The solubility has been analyzed, developing a statistical-mechanical method. The validity of this method has been judged by agreement with experimental data on the solubility. Comparisons also have been made between the conventional site-blocking models and this model. This model can make its theoretical curve agree well with the experimental data compared to those of the conventional site-blocking models at high hydrogen solubility over 0.5H/M. In the statistical-mechanical description, the solution behavior of tritium is similar to that of hydrogen, rather than that of deuterium from the difference in the spin weights.

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