Abstract
The solid state electrotransport of oxygen in yttrium was studied and the effective valence Z and the non-dimensional number δ(=uEL/D; u: mobility, E: electric field intensity, L: length of specimen, D: diffusion coefficient) of oxygen were measured by the tangent method under the following conditions; electric field intensity=7.2-10.6Vm-1, temperature=1, 173-1, 563K, initial oxygen content=0.5 mass%. The extraction conditions (analyzing temperature, pretreatment of the specimen, and selection and content of flux) for the accurate determination of oxygen in yttrium was also studied. The results obtained were:(i) For the oxygen analysis of yttrium, platinum was the best flux and should be added more than 0.5 of its molar fraction.(ii) The absolute values of the effective valence and δE-1L-1 of oxygen decreased with increasing either electric field intensity or temperature.(iii) The diffusion coefficient of oxygen in yttrium was determined as follows:Do/m2s-1=3.1×10-8 exp (-68700/RT)(iv) The mobility of oxygen in yttrium increased with increasing temperature.
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