Tsuyoshi Kawashima

Electronic conductivity measurements of 5 mol% TiO2-doped YSZ by a d.c.-polarization technique

The partial conductivities of electrons and holes in yttria stabilized zirconia doped with 5 mol% of TiO2 (5TD-YSZ) have been measured by the d.c.-polarization method using Hebb-Wagners asymmetric cell. The partial conductivities of holes, σp, and electrons, σn, were found to be proportional to po214 and po2−14, respectively, except for σn in the low po2 regime. The σn values in 5TD-YSZ were greater than those in non-doped ones reported by several investigators. In contrast, the σp values in 5TD-YSZ were almost the same with those in the non-doped ones. The activation energy for σn at the fixed po2 of 1.0 atm in 5TD-YSZ was smaller than that of the non-doped one, while that for σp in 5TD-YSZ was almost the same.