The tracer diffusivities of both cations, in monocrystalline 11 or 17mol%CaO-stabilized cubic zirconia, were measured at 1130 to 1460C. It was found that the Ca tracer diffusivity was more than 10 times faster than the Zr tracer diffusivity. The tracer-diffusion activation energy of both elements ranged from 5.1 to 5.6eV. The pre-exponential factors were larger (100 to 1000cm2/s, as opposed to 1 to 10cm2/s) than in the case of yttria-stabilized material. There was no significant dependence of the cation diffusivity upon the stabilizer content. This indicated diffusion via vacancy clusters.

Cation Diffusion in Calcia Stabilized Zirconia. M.Kilo, G.Borchardt, S.Weber, S.Scherrer, K.Tinschert, B.Lesage, O.Kaitasov: Radiation Effects and Defects in Solids, 1999, 151[1-4], 841-5