Abstract
The reversible change of oxygen content observed by gravimetric measurements on lanthanum (donor)-doped calcium titanate between specified states of reduction and oxidation is proportional to the lanthanum concentration. These measurements indicate that the lanthanum addition is compensated by additional oxygen up-take 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 CatiO3. There is excellent agreement between the calculated amounts of oxygen necessary to compensate the donor-dopant and the measured reversible oxygen weight-change between the oxidized and reduced state of equilibration. A single-phase region from La0.06Ca0.94Ti0.063+Ti0.064+O3 to La0.94Ca0.94TiO3.03 has been confirmed. The gravimetric measurements can be explained by a model involving a shear structure.
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