The oxygen tracer diffusion coefficient was measured for 9mol% scandia and

2mol% 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 were in the

range of 10−8 to 10−7cm2/s and the Arrhenius activation energy was calculated to be

0.9eV; at 600 to 900C. 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 was a good agreement between the measured tracer

diffusion coefficients (Ea = 0.9eV) and the diffusion coefficients calculated from

the DC total conductivity data (Ea = 1.0eV), the latter calculated using the Nernst–

Einstein relationship.

Oxygen Diffusion Studies on (Y2O3)2(Sc2O3)9(ZrO2)89. E.S.Raj, A.Atkinson,

J.A.Kilner: Solid State Ionics, 2009, 180[14-16], 952-5