Electrical conductivity of BaCe0.9Nd0.1O3?α in H2+H2O+Ar gas mixture |
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Authors: | A V Bannykh B L Kuzin |
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Institution: | (1) Institute of High-Temperature Electrochemistry, Ural Branch Ras, 20 S.Kovalevskaya St., 620219 Ekaterinburg, Russian Federation |
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Abstract: | Electroconductivity of BaCe0.9Nd0.1O3−α was studied as a function of the composition of the H2+H2O+Ar mixture and temperature in the interval from 873 to 1173 K. It was shown that the electroconductivity was independent
of PH2 (0.97 to 0.10 atm) and PO2 (10−21 to 10−26 atm), but depended on PH2O (0.08 to 0.005 atm). A mathematical processing of the PH2O dependencies of the electroconductivity, which was performed in terms of a classical model of defect formation in high-temperature
proton-conducting solid electrolytes, yielded equilibrium constants of the reaction of water dissolution in BaCe0.9Nd0.1O3−α and mobilities of protons and oxygen ions. The temperature dependencies of these quantities were used to determine the mobility
activation energies of protons (Ea=34±7 kJ/mole) and oxygen ions (Ea=72±8 kJ/mole), and also the enthalpy (ΔH=−150±25 kJ/mole) and the entropy (ΔS=153±26 kJ/mole·K) of the reaction of water
dissolution in BaCe0.9Nd0.1O3−α. |
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