A study was made of the electrical conductivity properties of ceramic TiO2 materials sintered at various temperatures within the range of 1473 to 1673K. The measurements were performed at 923 to 1353K and oxygen partial pressures, p(O2), of 10 to 105Pa. The determined values of the p(O2) exponent differed from those predicted by defect disorder models. This difference permitted the evaluation of both electronic and ionic components of the electrical conductivity. Using the Nerst-Einstein equation, the determined ionic component was verified against diffusion data in the available literature. The energy gap was deduced from both optical and electrical studies.

Charge and Mass Transport in Ceramic TiO2. Radecka, M., Rekas, M.: Journal of the European Ceramic Society, 2002, 22[12], 2001-12