Abstract
Gravimetric measurements on pure and lanthanum-doped SrTiO 3 have shown that the reversible change of oxygen content, between specified states of oxidation and reduction, is proportional to the dopant concentration. These measurements indicate that the donor dopants are electronically 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 nonstoichiometry of the undoped SrTiO 3. A single-phase region from La 0.2Sr 0.8Ti 4+ 0.8Ti 3+ 0.2O 3 to La 0.2Sr 0.8Ti 4+O 3.10 has been confirmed for lanthanum-doped SrTiO 3. The gravimetric measurements can be explained by a model involving a shear structure.
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