At 1773K the electrical conductivity of sapphire (single crystal of Al;Os) was found to be 1.25 mSm'. In sapphire oxygen diffusivity is 0.4 nm'm'. Can this high conductivity be from oxygen diffusion only? (% 30) (kB=1.381 1023 J/K, papphire=3.980 g/cm', M(Al)= 27 g/mol, M(O)= 16 g/mol, The unit cell contains six formula units.) n(ze) Djon kgT
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