Abstract
The perovskite La 0.7Sr 0.3Sc 0.8Ti 0.2O 2.95 has been prepared and its transport properties studied over the temperature range 170–1000 °C in varied oxygen partial pressures. The electrical conductivity was measured by impedance spectroscopy and the four-point dc technique in atmospheres of N 2/H 2/H 2O or N 2/O 2/H 2O; further measurements in N 2/D 2/D 2O or N 2/O 2/D 2O were used to observe the conductivity isotope effect. The faradaic transport of oxygen was measured in a two-compartment cell in an atmosphere of N 2/H 2/H 2O. La 0.7Sr 0.3Sc 0.8Ti 0.2O 2.95 in reducing atmospheres is found to exhibit both protonic and oxide ion conductivity, while at high oxygen partial pressures, p-type conductivity is observed. The total conductivity at 800 °C in air with ∼1% H 2O was 14 mS cm −1. At the same temperature, the observed H/D isotope effect indicates a protonic transport number of between 0.3 to 0.4, while the measurements on the faradaic transport cell gave a value of 0.5.
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