Abstract
Measurements of thermal conductivity and electrical resistivity of two niobium hydrides having hydrogen concentrations (H:Nb) of 0.78 and 0.86 were conducted in the temperature range 4.2–420 K. Distinct changes in the temperature dependence of both the thermal conductivity and the electrical resistivity were encountered, obviously connected with phase transitions: λ → β at 200 K and β → α′+ β and α′+ β → α′ at about 400 K. Moreover, at about 100 K our results corroborate the existence of a low temperature phase in these compounds. The analysis of the obtained results was conducted on the basis of the models of Wilson and Ziman.
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