The electrical conductivity of alkali molten carbonates coexisting with γ-LiAlO2 powders were measured by ac impedance method. The temperature and composition dependence of the electrical conductivity were investigated. The effects of the solid phase upon the ionic species were considered. The electrical conductivity varies with the liquid content and drastically increased at about 30vol%. The Arrhenius plot shows an increase of the electrical conductivity with increasing temperature. A significant value of the electrical conductivity below the salt melting point was observed. This indicated the existence of a non-frozen phase assuming conduction within the system. The activation energy increased with a decrease of apparent average thickness of the liquid layer. The influence of the solid system was conspicuous in Na2CO3 mixtures rather than in K2CO3 or Li2CO3 one. This shows that the order of magnitude of perturbations by the solid phase depends also on the cationic species associated within the system.

Effect of γ-LiAlO2 Powder on Ionic Conductivity of Coexisting Single Alkali Carbonates. M.Mizuhata, A.B.Béléké, H.Watanabe, Y.Harada, S.Deki: Electrochimica Acta, 2007, 53[1], 71-8