Electrical conductivity of Nd1−xCaxSc1−yMgyO3 perovskite-type oxides

The electrical conductivities of Nd1−xCaxSc1−yMgyO3 were measured in the temperature range from 673 to 1273 K under both wet and dry conditions. The optimum Ca2+ doping concentration to the Nd3+ site in NdScO3 was found to be the range from 5 to 10%. Hole conduction was predominant under dry and highly oxidized conditions of P(O2) > 10−2 kPa in the temperature range from 973 to 1273 K, and proton conduction was predominant under wet and reduced conditions in the temperature range from 673 to 973 K. Oxide ion conduction was predominant under wet and reduced conditions in the temperature range from 1073 to 1273 K. The Mg2+ doping concentration limit for the Sc3+ site to hold a single crystal phase was 2%, and this doping enhanced hole conduction.