Chemical Diffusion in Polycrystalline Al2O3 as Determined from Electrical Conductivity Measurements
作者： K. KITAZAWA , R. L. COBLE
DOI: 10.1111/J.1151-2916.1974.TB10880.X
关键词: Effective diffusion coefficient 、 Grain boundary diffusion coefficient 、 Ion 、 Analytical chemistry 、 Electrical resistivity and conductivity 、 Materials science 、 Diffusion (business) 、 Crystallite 、 Grain size 、 Diffusion layer
摘要: By analyzing the changes with time of electrical conductivity polycrystalline Al2O3 after O2 pressure was changed, a defect diffusion coefficient obtained which assigned to Al or O ion, whichever is faster-diffusing species. Both decreased grain size and MgO addition increase coefficient. The grain-boundary for undoped material estimated be: and that MgO-doped over range 1100° 1350°C (δ effective thickness boundary s segregation defects region). mechanism discussed in terms mobility.
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