Fig. 5. TG analysis of Pr0.75
O3 − δ
(a) reduction in 5%H2
(b) oxidation in air. The sample was heated to 900 °C in 5%H2
/Ar, dwelled for 2 h and cooled to room temperature in the same atmosphere followed by further heating to 900 °C in air, dwelling (2 h) and cooling to room temperature in air.