Abstract
Measurements of hydrogen solubility have been performed for pure Zr and Zr-O alloys with O/Zr atom ratios of 0.026–0.389 in the temperature range of 600–775° C. The isothermal section of the Zr-O-H ternary system at 700°C was constructed from the results for isothermal hydrogen pressure-hydrogen content curves at 700°C. The solubility data obtained at pressures below 10 2 Pa closely obeyed Sieverts' law. The solubility of hydrogen at a fixed pressure first increased with oxygen content in Zr, then decreased above a O/Zr ratio of 0.177. The enthalpy of solution showed a pronounced minimum at a O/Zr ratio of 0.111. The partial thermodynamic functions H ̄ H and S ̄ H for the Zr-O-H ternary solution were derived by applying a dilute solution model to the solubility data. The effect of solute oxygen on hydrogen solubility in Zr was discussed on the basis of the H ̄ H and S ̄ H values.
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