Abstract
Porous samples were used to evaluate the changes in electrical conductivity of SrTi 1− y Nb y O 3−δ materials with the oxygen partial pressure; this is needed to avoid slow responses to changes in the atmosphere. The power law dependence on the oxygen partial pressure corresponds to a predominant n-type conductivity. Deviations in strongly reducing conditions were interpreted on assuming that the charge imbalance caused by niobium additions may change with the working conditions. This defect chemistry model was confirmed by varying the oxygen partial pressure in the atmosphere. A coulometric titration technique was used to evaluate the changes in oxygen stoichiometry.
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