IONIC-CONDUCTIVITY OF CERIA YTTRIA STABILIZED ZIRCONIA ELECTROLYTE MATERIALS/

CeO2-based electrolytes are promising candidates for intermediate temp erature SOFC applications. However, they are prone to electronic condu ction at low partial pressures of oxygen. This paper describes the eff ect of yttria stabilized zirconia (YSZ) additions on (CeO2)(0.8)(GdO1. 5)(0.2) materials between 0 and 20 mol% YSZ [8 mol% YSZ (8YSZ) and 3 m ol% YSZ (3YSZ)], on the ionic conductivity. For all samples examined, a single cubic-phase was observed, stable between room temperature and 800 degrees C. Between 1 and 5 mol% 8YSZ and 3YSZ, the ionic conducti vity was very similar to (CeO2)(0.8)(GdO1.5)(0.2) with no YSZ addition s. However, the ionic domain increased from P-O2 = 10(-15) to 10(-17) atm, showing greater stability of the system containing YSZ.