Perovskite oxides, based upon PrGaO3, were synthesized by using standard solid-state techniques. In Pr1-xMxGa1-xMgyO3, where M was Ca or Sr, the solid-solution limit was x = 0.1 for Ca/Sr doped at A-sites and y = 0.2 for Mg doped at B-sites. The O-ion conductivity increased, and the activation energy decreased, with increasing dopant concentration at A or B sites - by single doping. However, the conductivity decreased when both A and B sites were doped; as compared with single doping only. It was found that Mg-doped samples had superior properties. That is, PrGa0.9Mg0.1O3 exhibited a maximum conductivity of 0.05S/cm at 800C while PrGa0.8Mg0.2O3 exhibited a minimum activation energy of 24.19kJ/mol. The O-ion transport number of the samples increased with increasing temperature. The conductivity of the samples was mainly ionic, although some hole conduction was observed.

The Conductivity of PrGaO3-Based Perovskite Oxides. Z.Liu, L.Cong, X.Huang, Z.Lu, W.Su: Journal of Alloys and Compounds, 2001, 314, 281-5