The atomic hydrogen permeability, JH, in fluorite-type (CeO2)0.85(CaO)0.15 was measured to confirm the influence of CaO concentration in CeO2 at 1050-1800 K. The decrease of JH with reducing temperature and the proportionality of log JH to inverse temperature are suggested. The estimated activation energies are 1.05±0.01, 1.35±0.02 and 0.22±0.04 eV at 1800-1400, 1400-1250 and 1250-1050 K, respectively. The JH of (CeO2)1-X(CaO)X decreases with increasing X and proportional to X5/2 at 1800-1300 K under H2-H2O atmosphere. H2 is decomposed to 2H+ and 2e- on the surface of the specimen and they permeate it. They hop between oxygen ions and cerium ions, respectively. It would be difficult for H+ to cross over Vö, which was produced by CaO, then JH decreased with increasing X. (CeO2)1-X(CaO)X would be the electron-proton mixed conductor under H2-H2O atmosphere at high temperatures.
|ジャーナル||Solid State Ionics|
|出版ステータス||Published - 2001 12月 1|
|イベント||10th International Conference on Solid State (SSPC10) - Montpellier, France|
継続期間: 2000 9月 24 → 2000 9月 28
ASJC Scopus subject areas
- 化学 (全般)