Abstract
Ca-doped Na+- β/β′′-alumina was synthesized using a solid-state reaction. The changes in the properties of Na+- β/β′′-alumina resulting from the presence of Ca impurity were studied. Ca (0–5 wt%) was added to the respective samples, which were then sintered. The specimens were characterized using X-ray diffraction, scanning electron microscopy, densimetry and impedance analysis. In the sintered specimens, the β′′-alumina phase fraction decreased as Ca content increased, whereas the relative sintered density increased. The surface morphology of Ca-doped Na+- β/β′′-alumina specimens showed a Ca-rich layer, which was the main cause of increase in the specific resistance.
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This work was supported by the Energy Efficiency & Resources Core Technology Programme of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resources by the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20142010102460).
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LEE, ST., LEE, DH., LEE, SM. et al. Effects of calcium impurity on phase relationship, ionic conductivity and microstructure of Na+- β / β″-alumina solid electrolyte. Bull Mater Sci 39, 729–735 (2016). https://doi.org/10.1007/s12034-016-1199-6
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DOI: https://doi.org/10.1007/s12034-016-1199-6