Low Temperature Sintering and Properties of Scandia- Doped Cubic Zirconia

Abstract

By the presence of 1 mol% Bi₂O₃, sintering temperature of 10 mol% Sc₂O₃-doped zirconia was lowered above 300°C and dense sintered bodies without a trace of rhombohedral phase were fabricated via low-temperature sintering at 1000- 1100°C. Sufficient conductvity of 0.33 S/ cm at 1000°C for an electrolyte of solid oxide fuel cells (SOFCs) was attained for 1 mol% Bi₂O₃- 10mol% Sc₂O₃-doped cubic zirconia (1Bi10ScSZ) sintered at 1200°C. A maximum power density of 1.61 W/ cm² was obtained at 1000°C in a cell test using 1Bi10ScSZ as SOFC electrolyte.