2005 年 73 巻 8 号 p. 680-685
The Raman spectra of molten lithium-potassium carbonate (LiKCO3) coexisting with porous inorganic powder were measured. The effect of the surface properties of the solid phase and relationship between the electrical conductivity and phase transition behavior of molten carbonate was discussed. The stretching band of CO32− ion (v1) shifted toward lower wavenumbers with a decrease of the liquid content and an increase of the specific surface area of the solid phase caused by the interaction between ionic species and solid surface. The shift width of wavenumber also depends on the kinds of solid phase. The change of peak position for the system containing α-Al2O3 powder is larger than that for the system containing ZrO2 powder. These tendencies correspond to the increase of the activation energy of the conductivity and the decrease of the melting point of the carbonate. For the results of conductivity and thermal analysis, the degree of the anomalous behavior of the molten carbonates by the solid phase was observed in the order of α-Al2O3 > γ-LiAlO2 > ZrO2. It is suggested that the influence of the solid phase on the anomalous properties related to the surface acidity.
