Oxygen Self-Diffusion in Magnesium- or Titanium-Doped Alumina Single Crystals |
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Authors: | Hajime Haneda Claude Monty |
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Affiliation: | Laboratories de Physique des Materiaux, CNRS 1, Meudon 92190, France |
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Abstract: | Oxygen Setf-diffusion coefficients have been measured in single crystals of N2O3 doped with Mg or Ti under an oxygen partial pressure of 20 kPa in the temperature range 1400° to 1700°C. Diffusion coefficients in Mg-doped crystals obey the equation Do (cm2/s) = 1 × 1011~ (1×1013) exp?915 ± 50(kJ/mol)/ RT ]. The diffusivity of oxygen in Ti-doped A12O3 is lower than Mg-doped A12O3. A vacancy mechanism explains these results. |
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Keywords: | alumina diffusion titanium magnesium doping |
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