Abstract
The reversible change of oxygen content observed by gravimetric measurements on tantalum-doped rutile (TiO2) between specified states of oxidation and reduction is proportional to the dopant concentration. These measurements indicate that donordopants are ionically compensated by additional oxygen uptake in the oxidized state. The range of this reversible change in oxygen stoichiometry is up to more than an order of magnitude larger than the oxygen non-stoichiometry of the undoped TiO2. Self-compensation has been measured in TiO2 with up to 10 at% Ta+5 and a single-phase region from TaO +50.1 Ti +30.1 Ti +40.8 O2 to Ta +50.1 Ti +40.9 O2.05 has been confirmed. The gravimetric measurements can be explained by either the creation of metal-deficit point defects (self-compensation) or a model involving a shear structure.
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