Water Incorporation in Tetragonal Zirconia
2004; Wiley; Volume: 87; Issue: 4 Linguagem: Inglês
10.1111/j.1551-2916.2004.00746.x
ISSN1551-2916
Autores Tópico(s)Electrocatalysts for Energy Conversion
ResumoSamples of 3 mol% Y 2 O 3 ‐stabilized tetragonal ZrO 2 ceramics were annealed at 250°C in atmospheres of water vapor pressures of 1 bar and 26 mbar. As demonstrated by the water uptake and the lattice expansion, water molecules were incorporated into the ZrO 2 lattice during annealing, and the amount of the incorporated water is determined by the water vapor pressure. Owing to the filling of oxygen vacancies by the incorporated water molecules, part of the tetragonal ZrO 2 transformed to the monoclinic structure, and protonic defects were induced. The expected proton conduction was confirmed by the polarity of the water vapor concentration cells.
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