抄録
The relation between dc conductivity evaluated from one-minute current after a voltage application and reciprocal temperature bends notably above 50°C supposedly due to an ionic layer build-up near an electrode and also due to the clean-up of charge carriers. The existence of the ionic layer is supported by the ac conductivity calculated from dielectric loss vs. 1⁄T curve and also by the current maximum in the current-time curves after the reversal of applied voltage polarity. The apparent activation energy of conduction Ec is about 23 kcal/mole. The mobility of charge carriers is estimated (μ\simeq2×10−8 cm2/volt. sec at 102°C) from an initial slope of current-time curves assuming the clean-up effect of charge carrier and its activation energy Eμ is obtained as 16 kcal/mole. The difference of Ec and Eμ may give rise to a discussion of the origin of ions.
