THERMODYNAMICS OF MOLYBDENUM-NIOBIUM-HYDROGEN TERNARY SOLID-SOLUTIONS

The enthalpy of solution of hydrogen has been measured in a series of Mo-Nb solid solutions in the composition range 0-77 at.% Nb. In the solid solutions of Mo and Nb there is good evidence that the enthalpy of solution of H will not be influenced by strain energy factors or by a change in the electronic work function of the metal surface with composition. No correlation between the measured enthalpies and the density of electron states at the Fermi surface was found. The binary Mo-Nb system was chosen because the density of states varies drastically across the system, exhibiting an extremum. © 1979.