Diffusion of niobium in yttria-stabilized zirconia and in titania-doped yttria-stabilized zirconia polycrystalline materials |
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| Affiliation: | 1. Centre for High Resolution TEM, Department of Physics, Nelson Mandela Metropolitan University, Port Elizabeth, South Africa;2. DST/NRF Centre of Excellence in Strong Materials at School of Chemical Engineering and Metallurgy, University of the Witwatersrand, Johannesburg, South Africa |
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| Abstract: | Bulk and grain boundary diffusion of Nb5+ cations in yttria-stabilized zirconia (YSZ, 8 mol% Y2O3–92 mol% ZrO2) and in titania-doped yttria-stabilized zirconia (Ti–YSZ, 5 mol% TiO2–8 mol% Y2O3–87 mol% ZrO2) 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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