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Control of Oxygen Permeability in Alumina under Oxygen Potential Gradients at High Temperature by Dopant Configurations
Author(s) -
Kitaoka Satoshi,
Matsudaira Tsuneaki,
Wada Masashi,
Saito Tomohiro,
Tanaka Makoto,
Kagawa Yutaka
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12935
Subject(s) - oxygen , oxygen permeability , permeation , materials science , wafer , dopant , oxygen transport , chemical engineering , doping , partial pressure , analytical chemistry (journal) , chemistry , membrane , nanotechnology , chromatography , biochemistry , optoelectronics , organic chemistry , engineering
The oxygen permeability of polycrystalline α‐alumina wafers, which served as models for alumina scales on alumina‐forming alloys, under steep oxygen potential gradients ( Δ P O 2) was evaluated at 1873 K. Oxygen permeation occurred by the grain‐boundary ( GB ) diffusion of oxygen from the higher‐oxygen‐partial‐pressure ( P O 2 ) surface to the lower‐ P O 2surface, along with the simultaneous GB diffusion of aluminum in the opposite direction. The fluxes of oxygen and aluminum at the outflow side of the wafer were significantly larger than at the inflow side. Furthermore, Lu and Hf segregation at the GB s selectively reduced the mobility of oxygen and aluminum, respectively. A wafer with a bilayer structure, in which a Lu‐doped layer was exposed to a lower P O 2and an Hf‐doped layer was exposed to a higher P O 2 , decreased the oxygen permeability. When the sign of Δ P O 2was reversed, however, the oxygen permeability of the wafer was comparable to that of a nondoped wafer. Co‐doping with both Lu and Hf markedly increased the oxygen permeation, presumably because the Lu‐stabilized HfO 2 particles that were segregated at the GB s acted as extremely fast diffusion paths for oxygen through the large number of oxygen vacancies introduced by the solid solution of Lu in the particles.