Abstract
The proton conduction of BaCe0.9Y0.1O3 -δ (BCY) film on Al2O3 (0001) substrate grown by RF magnetron sputtering has been studied as a function of film thickness (20-600 nm) in the temperature region of 300-700 °C. The lattice constants and grain size of the as-deposited film increase with increasing film thickness. The film thickness above ~ 200 nm, which close to the lattice constants of the bulk, shows high proton conductivity with small activation energy (EA) of ~ 0.3 eV below 500 °C. The BCY thin film has the mixed valent states of Ce4 + and Ce3 + created by the charge transfer from O 2p to Ce 4f states. The EA corresponds to the energy difference between the top of valence band and the Fermi level. These results originate to the changes of O-O bond length and oxygen vacancies in the a-c plane of the BCY thin film.
Original language | English |
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Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | Solid State Ionics |
Volume | 270 |
DOIs | |
Publication status | Published - 2015 Feb |
Externally published | Yes |
Keywords
- Activaion energy
- BaCe0.9Y0.1O3-d
- Electronic structure
- Lattice distortion
- Proron conduction
- Thin film
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics