High-temperature electron–hole transport in PrBaCo2O5+δ

The oxygen content, conductivity and thermopower in the double perovskite-like cobaltite PrBaCo2O5+δ are reported in the oxygen partial pressure range 2×10−6–0.21 atm and temperatures between 650 and 950 °C. The electrical properties are shown to be continuous through the transition from δ>0.5 to δ<0.5. The variations of transport parameters with temperature and oxygen content reveal hole polaron hopping conduction within oxygen non-stoichiometry domain δ<0.5.