“…They demonstrated that if the hydrogenation is performed under equilibrium conditions from the gas phase in the usual manner by which pressure-composition (p-c) isotherms are obtained (i.e., by continuously increasing the H-content in very small steps from 0 up to the pure -phase region), the resistivity variation with hydrogen content matches very closely the behaviour of the corresponding p-c isotherm. In the ␣-phase, they found a resistivity variation very similar to that observed in previous experiments by electrolytic hydrogenation [1,9,10]. In the mixed ␣ +  region, however, the rate of resistivity increase was strongly diminished and a similar plateau was observed as in the p-c isotherm.…”