抄録
Coulometric titration technique has been employed for the determination of the parameter, P\ominus, defined as the oxygen partial pressure at which the n-type and ionic conductivities are equal, for various commercial zirconia electrolytes in the temperature range from 1243 to 1873 K. Measured values of the parameter, P\ominus, have been expressed by a formula, logP\ominus=A+B/T, where A and B denote constants. The P\ominus values for CaO-stabilized ZrO2 have shown negligible dependence on the concentrations of impurities such as SiO2 and Al2O3 presumably because of the presence of 2CaO·SiO2. Measured values of P\ominus for MgO-stabilized ZrO2 have shown a slight decrease with an increase in the concentration of cubic ZrO2 from 40% to 100%.
