Abstract
The conductivity of single crystals of Al2O3+ Mg and the ionic and electronic transference numbers were measured at high temperatures as a function of orientation, oxygen pressure, and temperature. Optical absorption in the visible range was measured on cooled annealed crystals. The results are interpreted on the basis of a model with either Ali3‐ or VO as the dominant native defects and lead to expressions for the ionic mobility as a function of T and orientation, and for the position of the MgAl’level in the forbidden gap.
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