Abstract
A quasi steady state technique was used to determine the heat of transport Q + of oxygen in α-hafnium between 1400 and 1900 K and for various initial concentrations between 0.45 and 3.3 at.%. Q + is about 125 kJ mol −1 and shows no significant dependence upon concentration and temperature. The absolute thermoelectric power S of hafnium changes from about 6 μV K −1 at 400 K to −3 μV at 1100 K and then remains constant up to 1773 K. The influence of oxygen additions on S is pronounced at low temperatures but is negligible at temperatures above 1400 K. This behaviour of Q + and S is compared with that of oxygen in tantalum where both quantities are strongly dependent on concentration.
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