Abstract
The solubility of hydrogen in Nb and in alloys of Nb and Mo containing an atomic fraction of Nb between 0.90 and 0.50 was measured in the temperature range 300 – 600 °C, at hydrogen pressures of 3 – 600 mmHg. From the results thermodynamic quantities of dissolved hydrogen were evaluated. It was found that the nature of the interaction between the hydrogen atoms changes from attractive to repulsive as the molybdenum content increases. The variation of the relative partial molar enthalpy of the dissolved hydrogen with the Mo content is discussed in terms of the electronic structure of the alloy.
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