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- W2065649870 abstract "Al2O3 is an insulator at low temperature but a mixed conductor at high temperature, with transference numbers dependent on oxygen pressure and doping. Impurities always dominate the properties. Mg, Fe and Co act as acceptors; Ti, Si, H, Y and Zr act as donors. Samples dominated by the acceptors Fe or Mg can be compensated by hydrogen. In exactly compensated samples, conductivity by protons (Hi and H'i), electrons, holes, Al⋯i and V‴A1 has been observed. Analysis of the results leads to the parameters of ionic and electronic disorder. It is not known, however, which ionic disorder mechanism is dominant. Electrons and holes are large polarons. Electronic energy level positions for various dopants are given. In polycrystalline materials there is in certain samples an excess of electronic conductivity at grain sites smaller than 10 μm, but ionic conductivity is decreased. Large diffusivities of oxygen along grain boundaries must be due to neutral species, probably Oxi. Al2O3 est un isolant à basse temperature et un conducteur mixte ionique et électronique à haute temperature. Les nombres de transport dependent de la pression partielle d'oxygène et du taux d'impurété. Ces impurétés dominent toujours les propriétés physiques. Mg, Fe et Co sont des accepteurs d'électrons alors que Ti, Si, H, Y et Zr sont des donneurs d'électrons. L'effet des impurétés acceptrices, dans les cristaux où elles sont majoritaires, peut être compensé par l'hydrogène. Dans les échantillons parfaitement compensés, conduction par l'hydrogène (H⋯i et H'i), électrons, trous, Al⋯i et V‴Al a été mise en evidence. Les valeurs des paramètres de désordre ionique et électronique sont établies à partir de l'analyse des resultats experimentaux. Cependant il n'a pas été possible de determiner le mécanisme dominant. Les électrons et les trous sont des grands polarons et les niveaux d'énérgie de plusiers dopants sont donnés. Dans certains échantillons polycrystallins la conductibilité électronique augmente lorsque la taille des grains est inférieure à 10 μm mais la conductibilité ionique est diminué. La diffusion rapide de l'oxygène par les joints de grains est attribuée à la migration d'espèces neutres, probablement Oxi." @default.
- W2065649870 created "2016-06-24" @default.
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- W2065649870 date "1984-03-01" @default.
- W2065649870 modified "2023-09-23" @default.
- W2065649870 title "Defect related properties of doped alumina☆" @default.
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- W2065649870 doi "https://doi.org/10.1016/0167-2738(84)90148-6" @default.
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