Changes in Aging Behavior and Defect Structure of Y[sub 2]O[sub 3] Fully Stabilized ZrO[sub 2] by In[sub 2]O[sub 3] Doping

Based on the causes of decreased conductivity of yttria stabilized zirconia (YSZ) with aging, which were clarified by previous studies, methods of suppressing decreased conductivity of 8 mol % stabilized 92 mol % (8YSZ) with aging were investigated and a new stabilized zirconia was developed. For one method, different amounts of were doped into 8YSZ. The electrochemical properties of these new zirconias were measured, and the changes in the micro and local structure were characterized using X-ray diffraction, high resolution electron microscopy, electron diffraction, and internal friction measurement. The present results indicate that the appropriate amount of doping, or 5 mol %, into 8YSZ effectively suppresses aging effect and dopant effects in 8YSZ.