Abstract
Solubility measurements of hydrogen and deuterium in isotropic graphites IG 110U and POCO AXF-5Q have been performed in the temperature range of 700–1000° C at pressures below 2×10 4 Pa by a constant volume method. All the solubility data closely obeyed Sieverts' law. The solubility of hydrogen was slightly different from that of deuterium. The solubility in IG 110U graphite was larger than that in POCO AXF-5Q graphite, while the enthalpy of solution was almost the same. On the basis of dilute solution model, the solubility of hydrogen isotopes in graphite was analyzed, and the partial thermodynamic functions were obtained. The isotope effect on solubility was discussed on the assumption that hydrogen isotope atoms behave as harmonic oscillators in the graphite matrix.
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