Defect Chemistry of (La,Sr)MnO3 |
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Authors: | Janusz Nowotny Mieczyslaw Rekas |
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Affiliation: | Materials Division, Lucas Heights Science and Technology Centre, Australian Nuclear Science &Technology Organisation, Menai, NSW 2234, Australia |
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Abstract: | Defect-disorder models are derived for undoped and strontium-doped LaMnO3. A random-defect model and a cluster-defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical-conductivity data. A good agreement between the random-defect model and the experimental data is shown. |
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