Abstract
Experimental values are reported for the temperature dependences of the incremental resistivity due to hydrogen in pure Ta and in Nb-Ta, Nb-V, Nb-Ti and Nb-Mo alloys. The results seem best explained by consideration of (i) the interactions between interstitial H atoms and the substitutional solutes and (ii) the possible importance of electronic effects. The influence of the vibrational amplitude of hydrogen interstitials on the temperature dependence of the hydrogen resistivity increment may be too slight to detect in the presence of the aforementioned effects.