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Thermoelectric Behavior of BaZr0.9Y0.1O3−d Proton Conducting Electrolyte
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Thermoelectric Behavior of BaZr0.9Y0.1O3−d Proton Conducting Electrolyte
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Thermoelectric Behavior of BaZr0.9Y0.1O3−d Proton Conducting Electrolyte
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Journal Article
Thermoelectric Behavior of BaZr0.9Y0.1O3−d Proton Conducting Electrolyte
2019
Overview
BaZr0.9Y0.1O3-δ (BZY10), a promising proton conducting material, exhibits p-type conduction under oxidative conditions. Holes in BZY10 are of the small polaron type. However, there is no clear understanding at which places in the lattice they are localized. The main objectives of this work were, therefore, to discuss the nature of electronic defects in BZY10 on the basis of the combined measurements of the thermo-EMF and conductivity. Total electrical conductivity and Seebeck coefficient of BZY10 were simultaneously studied depending on partial pressures of oxygen (pO2), water (pH2O) and temperature (T). The model equation for total conductivity and Seebeck coefficient derived on the basis of the proposed defect chemical approach was successfully fitted to the experimental data. Transference numbers of all the charge carriers in BZY10 were calculated. The heat of transport of oxide ions was found to be about one half the activation energy of their mobility, while that of protons was almost equal to the activation energy of their mobility. The results of the Seebeck coefficient modeling indicate that cation impurities, rather than oxygen sites, should be considered as a place of hole localization.
