Conduction in Bi2O3-based oxide ion conductor under low oxygen pressure. II. Determination of the partial electronic conductivity |
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Authors: | T. Takahashi T. Esaka H. Iwahara |
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Affiliation: | 1. Department of Applied Chemistry, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
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Abstract: | In order to investigate the partial electronic conduction in the high oxide ion conductor of the system Bi2O3-Y2O3 under low oxygen pressure, e.m.f. and polarization methods were employed. Although the electrolyte was decomposed when the (P_{{text{O}}_{text{2}} }) was lower than the equilibrium (P_{{text{O}}_{text{2}} }) of Bi, Bi2O3 mixture at each temperature, the ionic transport number was found to be close to unity above that (P_{{text{O}}_{text{2}} }) . The hole conductivity (σ p) and the electron conductivity (σ p) could be expressed as follows, $$begin{gathered} sigma _p Omega cm = 5 cdot 0 times 10^2 left( {P_{O_2 } atm^{ - 1} } right)^{{1 mathord{left/ {vphantom {1 4}} right. kern-nulldelimiterspace} 4}} exp left[ { - 106 kJleft( {RT mol} right)^{ - 1} } right] hfill sigma _p Omega cm = 3 cdot 4 times 10^5 left( {P_{O_2 } atm^{ - 1} } right)^{ - {1 mathord{left/ {vphantom {1 4}} right. kern-nulldelimiterspace} 4}} exp left[ { - 213 kJleft( {RT mol} right)^{ - 1} } right] hfill end{gathered} $$ These values were much lower than the oxide ion conductivity under ordinary oxygen pressure. |
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