(Invited) Electrical Conductivity of Ceria-Based Oxide/Alkali Carbonate Eutectics Nanocomposites

Abstract

Thermal properties and the electrical conductivity for the SDC/ternary carbonate coexisting system was measured and the influence of the solid phase was discussed. In the ceria-based oxide/carbonate coexistence system, the melting enthalpy of carbonate disappeared when the liquid phase volume fraction was less than 45 vol%, and the melting point decreased due to the influence of the solid phase. The activation energy of conductivity increases in the region where the apparent average thickness is approximately 0.5 nm or less, the carbonate is significantly affected by the solid phase in a very narrow range, and the ceria-based oxide causes ion migration in the interface layer. It became clear that it did not inhibit. From these results, it was clarified that the low temperature characteristics are remarkably improved although the influence of the solid phase on the ionic conduction is limited.