Bulk and grain boundary diffusion of titanium in yttria-stabilized zirconia

Bulk and grain boundary diffusion of titanium in yttria fully stabilized zirconia was studied in air in the temperature range from 1200 to 1400°C. The secondary ion mass spectrometry (SIMS) technique was used to determine the diffusion profiles in the form of mean concentration vs depth in B-type kinetic region. In order to confirm that the diffusion occurred in the chosen kinetic regime the 3-dimensional distribution of titanium was also determined. The obtained results allowed to calculate the temperature dependence of the bulk diffusion coefficient D and the grain boundary diffusion parameter Dʹδs. Activation energies of these processes amount to 505 and 340 kJ mol−1, respectively.