Accelerated ceria–zirconia solubilization by cationic diffusion inversion at low oxygen activity
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Journal of Materials Chemistry A
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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 ¼ 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 ¼ 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.
Como referenciar
ESPOSITO, VINCENZO; DE, WEI N.; MARANI, DEBORA; TEOCOLI, FRANCESCA; THYDEN, KARL T.S.; FLORIO, DANIEL Z. de; FONSECA, FABIO C. Accelerated ceria–zirconia solubilization by cationic diffusion inversion at low oxygen activity. Journal of Materials Chemistry A, v. 4, n. 43, p. 16871-16878, 2016. DOI: 10.1039/c6ta06308j. Disponível em: http://repositorio.ipen.br/handle/123456789/26914. Acesso em: 30 Dec 2025.
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