Abstract
Bulk and grain boundary diffusion of Nb 5+ cations in yttria-stabilized zirconia (YSZ, 8 mol% Y 2O 3–92 mol% ZrO 2) and in titania-doped yttria-stabilized zirconia (Ti–YSZ, 5 mol% TiO 2–8 mol% Y 2O 3–87 mol% ZrO 2) was studied in air in the temperature range from 900 to 1300 °C. Experiments were performed in the B-type kinetic region. Diffusion profiles were determined using the secondary ion mass spectrometry (SIMS). The temperature dependencies of the bulk diffusion coefficient D and the grain boundary diffusion parameter D′ δs for both the materials were calculated. The activation energies of these transport processes in YSZ amounts to 258 and 226 kJ mol −1, respectively, and 232 and 114 kJ mol −1 in Ti–YSZ. The results were compared to the diffusion data of other cations previously obtained for the same material.
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