Impact of the Sintering Additive Al2O3 on the Electrical Conductivity of Proton-Conducting Electrolyte CaZr0.95Sc0.05O3 – δ
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The impact of sintering additive Al2O3 on the electrical conductivity of calcium zirconate-based polycrystalline proton-conducting electrolyte CaZr0.95Sc0.05O3 – δ (CZS) is studied. With the sintering additive Al2O3, ceramic samples synthesized by a combustion technique are denser, and relatively low synthesis temperatures can be used (1470°C). Adding 0.1–0.5 wt % Al2O3 leads to an increase in the grain size from 100 nm to 1–2 μm. Increasing the Al2O3 content up to 0.3 wt % favors a growth in the electrolyte conductivity. For samples containing Al2O3, calcium aluminates are detected at grain boundaries. In samples exposed to humid air, charge transfer both in the grain bulk and at intergrain boundaries is found to be mediated by protons.
Keywords:calcium zirconate proton-conducting electrolyte sintering additive electrical conductivity
Scanning electron microscopy and X-ray diffraction studies were performed using the equipment of the Center of Collective Use “Composition of Matter,” Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences. The authors are grateful to B.D. Antonov for the X-ray studies.
The work was supported within the Program for Fundamental Research by the Ural Branch of Russian Academy of Sciences (project no. 18-10-3-42).
CONFLICT OF INTEREST
We have no conflicts of interest to declare.
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