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Issue 43, 2016
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Accelerated ceria–zirconia solubilization by cationic diffusion inversion at low oxygen activity

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Abstract

Fast elemental diffusion at the Gd-doped ceria/Y-stabilized zirconia interface occurs under reducing conditions at low oxygen activity (pO2 < 10−12 atm) and high temperature (1400 °C). This effect leads to formation of thick ceria–zirconia solid solution reaction layers in the micro-range vs. thin layers of few tens of nanometers under oxidative conditions (i.e. in synthetic air at pO2 = 0.21 atm). The fast dissolution occurs by an inversion of the dominating limiting mechanism from the expected Zr4+ diffusion into the CGO lattice at high pO2 to an unexpected Ce3+ diffusion into the YSZ component under reducing conditions. The diffusion coefficient of 8-fold coordinated Ce3+ in YSZ at 1400 °C and pO2 = 10−13 atm is estimated to be around 10−11 cm2 s−1. This value is around 3 orders of magnitude higher than Zr4+ interdiffusion in CGO under oxidative conditions and about 8 orders of magnitude higher than Ce4+ self-diffusion in CGO in air at the same temperature.

Graphical abstract: Accelerated ceria–zirconia solubilization by cationic diffusion inversion at low oxygen activity

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Publication details

The article was received on 25 Jul 2016, accepted on 01 Oct 2016 and first published on 04 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA06308J
Citation: J. Mater. Chem. A, 2016,4, 16871-16878
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    Accelerated ceria–zirconia solubilization by cationic diffusion inversion at low oxygen activity

    V. Esposito, D. W. Ni, D. Marani, F. Teocoli, K. T. Sune Thydén, D. Z. De Florio and F. C. Fonseca, J. Mater. Chem. A, 2016, 4, 16871
    DOI: 10.1039/C6TA06308J

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