Oxygen diffusion studies on (Y2O3)2(Sc2O3)9(ZrO2)89

The oxygen tracer diffusion coefficient (D⁎) has been measured for 9 mol% scandia 2 mol% yttria co-doped zirconia solid solution, (Y2O3)2(Sc2O3)9(ZrO2)89, using isotopic exchange and line scanning by Secondary Ion Mass Spectrometry, as a function of temperature. The values of the tracer diffusion coefficient are in the range of 10− 8–10− 7 cm2 s− 1 and the Arrhenius activation energy was calculated to be 0.9 eV; both valid in the temperature range of 600–900 °C. Electrical conductivity measurements were carried out using 2-probe and 4-probe AC impedance spectroscopy, and a 4-point DC method at various temperatures. There is a good agreement between the measured tracer diffusion coefficients (D⁎, Ea = 0.9 eV) and the diffusion coefficients calculated from the DC total conductivity data (Dσ, Ea = 1.0 eV), the latter calculated using the Nernst–Einstein relationship.