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Methods of suppressing decreased conductivity in 8 mol% Y[sub 2]O[sub 3]-stabilized-92 mol% ZrO[sub 2] (8YSZ) with aging were investigated. Different amounts of Sc[sub 2]O[sub 3] were doped into 8YSZ. The electrochemical properties of Sc[sub 2]O[sub 3]-doped 8YSZ were measured, and the microstructural and local structural changes were characterized. The present results indicate that an appropriate amount of Sc[sub 2]O[sub 3] doping, 3 or 4 mol%, effectively suppresses decreased conductivity with aging in 8YSZ. [ABSTRACT FROM AUTHOR]

We have investigated the temperature dependence of unit-cell and structural parameters of ceria (cerium dioxide, CeO2) from room temperature to 1770 K by neutron powder diffraction and the Rietveld method. The unit-cell parameter increases continuously with temperature. It was confirmed that the Debye–Waller factor of oxygen B(O) is larger than that of cerium B(Ce) at any temperature from room temperature to 1770 K. Both B(O) and B(Ce) increase with an increase of temperature. [Copyright &y& Elsevier]