Electrical Conductivity of the Coexisting System Containing Molten Carbonates and Rare-Earth Oxide

• Main Authors: Mizuhata, Minoru, Ohashi, Toshifumi, Béléké, Alexis B.
• Format: Conference Proceeding
• Language: English
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/1.3484802

The electrical properties of CeO 2 /(Li 0.52 Na 0.48 ) 2 CO 3 coexisting system are investigated by AC impedance, differential thermal analysis and polarized Raman scattering spectroscopy. The system shows a dependence of the electrical conductivity upon the temperature. The transition point varies with the apparent average thickness of the liquid phase, while the activation energy remains constant at any distance from the solid phase. The symmetric stretching mode of the polarized Raman spectra shows that carbonate ion maintains its D 3h symmetry in the presence of ceria. A constant value of the depolarization ratio of the raman band with regard to the apparent average thickness confirms that the symmetry of carbonate ions in the molten state is not altered by the presence of ceria powder. These findings contribute to the understanding of the properties of ceria-based carbonate electrolyte for intermediate temperature fuel cells.