Bulk Conductivity and Defect Chemistry of Acceptor-Doped Strontium Titanate in the Quenched State |
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Authors: | Rainer Waser |
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Affiliation: | Philips GmbH Forschungslaboratorium Aachen, D-5100 Aachen, Federal Republic of Germany |
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Abstract: | The grain bulk conductivity of acceptor-doped SrTiO3 ceramics was investigated by the impedance analysis method after quenching from high-temperature equilibria. The influence of the oxygen partial pressure during equilibration, P EqO2, is described in terms of a defect model for titanates. From a comparison between the experimental results and the predictions of this model, a predominant ionic conductivity is concluded for a wide P EqO2 range (approximately 10−11 to 105 Pa). The influence of the ionization energy of the acceptors and of possible defect association is discussed. |
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Keywords: | conductivity defects acceptor doping strontium titanate |
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