Nombre de transport et conductivite cationique dans les oxydes de calcium et de strontium |
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| Authors: | M. Gauthier M. Duclot A. Hammou C. Déportes |
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| Affiliation: | Laboratoire d''Electrochimie des Solides — Ecole Nationale Superieure d''Electrochimie et d''Electrometallurgie de Grenoble — F 38.401 Saint Martin d''Heres, France |
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| Abstract: | The cationic transference numbers have been determined for alkaline earth oxides using sample linear expansion measurements coupled with coulometric titration.Single crystal CaO has been studied in the temperature range 1200–1450°C, under oxygen partial pressures varying from 1 to 10?5 atm. Under air, tCa at 1300°C is close to 0.02.Polycrystalline samples of SrO, under air, were tested from 1100°C to 1350°C, and showed a tSr value of 0.012 at 1300°C.The total conductivity of CaO was measured to obtain a value for the cationic conductivity. This value is compared with the data obtained from the self diffusion coefficient of Ca in CaO. |
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