The total electrical conductivities of Sr
2+ and Al
3+-doped LaScO
3 materials, La
1−xSr
xSc
1−yAl
yO
3 (
x=0.1–0.325,
y=0–0.01), were examined under wet, dry, reduced and oxidized conditions and were found to express mixed ionic and electronic conductivities. In the high temperature range of 1073 to 1273 K, oxide-ion conduction was predominant. In the systematic measurement of electrical conductivity, we found that the oxide-ion conductivities and activation energies show continuous changes over a wide range of Sr
2+ dopant concentrations. We also found that oxide-ion conduction was enhanced by Sr
2+ doping to the La
3+ site. The ionic transference number,
tion, calculated from the conductivity data under high and low
P (O
2) conditions was 0.73 (
x=0.325,
y=0.01) at 1273 K.
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