| Y2O3가 도핑된 SrZrO3에서의 프로톤전도도 |
| 백현덕 |
| 홍익대하교 재료공학부 |
| Proton Conduction in Y2O3-doped SrZrO3 |
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| ABSTRACT |
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Electrical conduction of $SrZrO_3$ doped with $Y_2O_3$ was measured as a function of gas atmosphere and temperature by impedance spectroscopy. Hydrogen dissolution, due to an enhanced driving force in the presence of oxygen, results in protonation by water incorporation. Proton conductivity increased with water vapor pressure, ${P_w}^{1/2}$. In the pure hydrogen atmosphere, the dissolution of hydrogen,$H_2(g)=2H_{i}$ +2e', is supposed to be driven by a reduced activity of electrons, ascribable to their trapping in oxygen vacancies. The activation energy of electrical conductivity was 50 kJ/mol, in wet argon atmosphere in the temperature range of $600~900^{circ}C$, similar to those reported for proton conduction in the literature. Grain boundary effect in proton conduction was substantial in the 10% doped case at temperatures lower than $700^{circ}C$. ꤠ 돀胊 |
| Key words:
$SrZrO_3$, Hydrogen dissolution, Grain boundary, Temperature dependence, Water vapor pressure |
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