Electrical Properties of Modified TZP(+TiO(2),FeO(x))

1 to 24 mol% TiO(2) and FeO(x) were added to 3.2 mol% Y(2)O(3) doped ZrO(2) (Z3Y) to obtain tetragonal zirconia polycrystals (TZP) with modified electronic properties. The materials were prepared by coprecipitation which allows to obtain fine, homogeneous and sinteractive powders. The solubility of TiO(2) in Z3Y can reach 24 reel%, while the maximum solubility of FeO(x) is about 8 mol%. The impedance results show a decrease of the bulk and total conductivity of titania doped TZP with increasing titania concentration, while those of FeO(x) doped TZP show only minor changes. The Hebb-Wagner polarization method was applied to evaluate the partial hole and electron conductivities. Three models are presented to interpret the polarization curves. 1.6 reel% FeO(x) doped TZP has higher hole conductivity in air, while titania doped TZP has higher electronic conductivity at low oxygen partial pressures as compared to pure Z3Y.