Abstract
An emf technique with a ThO2-Y2O3 electrolyte has been used to measure oxygen activity and diffusivity in Nb-V, Nb-Mo, Ta-W, Ta-Re, and Ta-N alloys between 850 and 1130 °C. Oxygen activity is decreased by V additions to Nb and increased in the other alloys. Oxygen diffusivity is mostly lower in comparison with the base metal; however, for Re and W at low contents in Ta it was shown unambiguously by a difference technique that diffusivity is higher at higher temperatures and lower at lower temperatures. The results are discussed within the framework of a two-level system assuming different potential energies for oxygen atoms being either in octahedral sites far away from substitutionally dissolved foreign atoms or in the neighborhood of these atoms.
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