Survey of the quasi-ternary system La0.8Sr0.2MnO3–La0.8Sr0.2CoO3–La0.8Sr0.2FeO3 |
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Authors: | F Tietz I Arul Raj M Zahid A Mai D Stver |
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Institution: | aForschungszentrum Jülich GmbH, IWV-1, D-52425 Jülich, Germany |
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Abstract: | An overview on the variation of the thermal expansion, the electrical conductivity as well as non-stoichiometry of the oxide content as a function of composition within the quasi-ternary system La0.8Sr0.2MnO3?δ–La0.8Sr0.2CoO3?δ–La0.8Sr0.2FeO3?δ in air is presented. The various powders were synthesized under identical conditions. The DC electrical conductivity values of the compositions at 800 °C in air vary in a wide range from 15 to 1338 S cm?1. The magnitude of electrical conductivity of the perovskites is mainly determined by the percentage of cobalt in the compositions. A similar behaviour was observed for the measured thermal expansion coefficients between room temperature and 1000 °C in air, increasing from 10.9 to 19.4 × 10?6 K?1 as a function of cobalt content. Changes in the oxygen stoichiometry of the materials were characterized by temperature-programmed oxidation measurements. |
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