Abstract
The diffusivity of oxygen in tantalum and tantalum-based alloys was determined from EMF measurements on solid electrolytic cells over the temperature range of 873–1373 K (600–1100°C). Oxygen diffusion in tantalum was slightly decreased by small additions of Nb, V, Mo, Ni and Ti. Several percent of Mo and W in tantalum have a larger effect in lowering oxygen diffusivity, and Cr was particularly effective, lowering the oxygen diffusivity by more than an order of magnitude. A trapping model was used to bit diffusion data in tantalum-based alloys, and the trapping energies were compared with thermodynamic quantities and with calculated values of elastic interaction energy. The agreement was not good.
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