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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

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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2 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, psapphire=3.980 g/cm², M(Al)= 27 g/mol, M(O)= 16 g/mol, The unit cell contains six formula units.) n(ze)²Djon kgT h=6.626 103ª Js e=1.6 1019 C c=3 10® ms² NA=6.022 10²3 atomsmol N(Si)=5 10²² atomscm³ n.(Si)=1 101º cm³ He(Si)=1350 cm²V's! Hn(Si)=450 cm²V1s?
Transcribed Image Text:2 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, psapphire=3.980 g/cm², M(Al)= 27 g/mol, M(O)= 16 g/mol, The unit cell contains six formula units.) n(ze)²Djon kgT h=6.626 103ª Js e=1.6 1019 C c=3 10® ms² NA=6.022 10²3 atomsmol N(Si)=5 10²² atomscm³ n.(Si)=1 101º cm³ He(Si)=1350 cm²V's! Hn(Si)=450 cm²V1s?
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