Experimental and theoretical investigation of oxygen diffusion in stabilised zirconia |
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| Authors: | M Kilo C Fundenberger H Argirusis M A Taylor G Borchardt M Weller |
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| Institution: | 1. Institut für Metallurgie , TU Clausthal, Robert-Koch-Str. 42, Clausthal-Zellerfeld , D-38678 , Germany;2. Lennard-Jones Laboratories, School of Chemistry and Physics , Keele University , Keele, Staffs , ST5 5BG , United Kingdom;3. Institut für Metallurgie , TU Clausthal, Robert-Koch-Str. 42, Clausthal-Zellerfeld , D-38678 , Germany;4. MPI für Metallforschung , Heisenbergstr. 3, Stuttgart , D-70569 , Germany |
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| Abstract: | Oxygen diffusion in stabilised zirconias is investigated by the simultaneous application of computer modelling and experimental techniques to yttria-stabilised zirconia. Using the Mott-Littleton method, migration pathways for oxygen ions have been calculated in perfect cubic zirconia. The oxygen migration occurs through a straight pathway, but not starting from the ideal lattice positions. The calculated activation energy of migration is about 0.2 v eV. Oxygen transport is investigated experimentally in YSZ containing 8-24 v mol% Y 2 O 3 as a function of stabiliser content by combining the stable isotope ( 18 O 2 ) method with ionic conductivity measurements. It was found that for a given temperature, diffusion and conductivity are highest for YSZ containing 8-10 v mol% yttria, but with differing activation energies which can be compared to the calculated values. |
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| Keywords: | Oxygen Transport Tracer Diffusion Dc Conductivity Stabilised Zirconia Ysz |
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