The thermodynamic properties of the iron-chromium system upon the introduction of hydrogen was investigated. Various models were reviewed and applicability was discussed with respect to the system under consideration. Using the quasi-regular solution model a relation between the hydrogen solubility and the partial enthalpy of solution of the hydrogen atom was derived. Next, the screened proton model for hydrogen in solution was also reviewed and a proportionality found to exist between the enthalpy of solution and the electronic specific heat coefficient. Formulations for the screening were presented to account for the possibility of the s- or d-electrons acting as the major screen. Possible experimental verification for each were also discussed. The partial thermodynamic properties of the interstitially dissolved H2-atoms were derived from the temperature dependence of the solubility. It was found that the hydrogen solute atoms obey the quasi-regular solution model at all the solvent compositions investigated.
- Pub Date:
- December 1975
- Solid Solutions;
- Thermodynamic Properties;
- Thermodynamics and Statistical Physics