<Original Papers>Galvanostatic Polarization Measurement of the Molten Silver-Solid Electrolyte (ZrO_2・CaO) System

The electrode reaction kinetics in the molten silver-ZrO_2・CaO system was investigated at 1100℃ by the galvanostatic relaxation method. The exchange current density (O^&lrarr;O+2e) and the double layer capacitance obtained were 55±15 mA/cm^2 and 18±5 μF/cm^2,respectively. Diffusivity of oxygen in molten silver was also determined by changing the bulk concentration of oxygen and the experimental time on the assumption that the mass-transfer process is the rate controlling step. It is concluded the diffusivity of oxygen in molten silver over the measurement time range more than 10 sec is in agreement with the previously reported data, but over the range of less than 10 sec it varies with the bulk concentration of oxygen