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Abstract
The electrical conductivity calculated from ac impedance measurement and differential thermal analysis (DTA) are measured for molten (Li0.52Na0.48)2CO3 coexisting with nano-ordered CeO2 and ceria-based oxides such as CeO2:Sm3+. The influence of surface properties of the oxides with smooth surface, narrow particle size distribution, and large specific surface area at around the eutectic point is discussed. The specific surface area of the solid phase of used samples are ca. 50 m2g-1.Temperature dependence of the electrical conductivity for (Li0.52Na0.48)2CO3 coexisting with nano-ordered CeO2 and CeO2:Sm3+ at melt content less than ca. 15 vol% does not indicate a remarkable change in conductivity at the temperature range around the eutectic point of molten carbonate, whereas the transition point was observed obviously in Arrhenius plot’s for CeO2 (1.5 m2g-1)/(Li0.52Na0.48)2CO3 (5 vol%) coexisting system in previous study. Obtained DTA spectra indicate that the melting enthalpy disappeared below the melt content of 30 vol% or less. In such case, the apparent average thickness of the carbonate melts is less than ca 0.5 nm as remarkable influences of solid phase are observed. Sm3+ doping contributes an increase of electrical conductivity of composites below the eutectic points of molten carbonate.
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