The conductivity and permittivity in the c‐direction of single crystal boule sapphire slices and flux grown platelets have been measured over a temperature range of 700 to 1500°C, an oxygen partial pressure range from 1 to 2 × 10−2 at, at dc, and over a frequency range from 70 Hz to 5 MHz. A surface and a bulk process are postulated, and the electronic or ionic nature of the latter discussed.
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