Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9781772 | Journal of Physics and Chemistry of Solids | 2005 | 7 Pages |
Abstract
The present work describes application of the high-temperature Kelvin probe for in situ monitoring of the charge transfer at the gas/solid interface at elevated temperatures (up to 1200Â K) using work function measurements. Performance of the probe is described for the oxygen/zirconia system at elevated temperatures. The work function data for yttria-stabilized (10Â mol%) zirconia during oxidation in the temperature range 298-1173Â K are reported. The determined work function changes during oxidation are considered in terms of the reactivity mechanisms between oxygen and zirconia, such as oxygen incorporation and oxygen chemisorption. The effect of temperature on the oxygen chemisorption isobar is considered in terms of surface coverage of zirconia with chemisorbed oxygen species, including singly ionized atomic species and singly ionized molecular species. The respective chemisorption isobars, determined at p(O2)=21Â kPa, exhibit maxima at â¼300 and 1000Â K.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
M. Yamawaki, T. Bak, M.K. Nowotny, J. Nowotny, C.C. Sorrell,