Abstract
Thermotransport of oxygen in tantalum with additions of nitrogen, tungsten and rhenium was studied by a steady state technique. As in pure tantalum metal oxygen atoms migrate to the hotter parts of the specimen. The transport is drastically reduced by ternary additions of some at.%. The effect of these ternary additions on the relative change of the heat of transport, Q ∗ , and of the thermoelectric power, S, measured for the same tantalum alloys is equal. This linear interrelation between Q ∗ and S is in accordance with the two band model calculation of H. B. Huntington. Electrotransport measurements for oxygen in two tantalum-tungsten alloys show that only Q ∗ but not the effective valence Z ∗ is strongly changed by the tungsten additions. Qualitative explanations are given for this behaviour using known atomistic models of the transport phenomena.
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