Phases, oxygen release and absorption behaviour was investigated for Zr-Ce-Sn-Pr-O mixed oxides (Zr2/8Cex/8Sn y/8Pr(6-x-y)/8)O2-z (x=1.5, 4.5, y=0.5) together with the effect of Cu addition. Major phases of Sn-added samples were similar to those of Sn-free (Zr2/8Cex/8Pr (6-x)/8)O2-z phases, that is, CaF2-like λ and C phases for Pr-rich and Ce-rich compounds, respectively. All samples contained a SnO2 or a Sn phase. When Cu was added, repetitive oxidation and reduction appeared to promote the fine dissolution of Sn and Cu through bulk phases. OSC values of both (Zr2/8Ce 1.5/8Sn0.5/8Pr4/8)O2-z and (Zr 2/8Ce4.5/8Sn0.5/8Pr1/8)O 2-z were larger than those of the corresponding Sn-free samples. For the Ce-rich sample, Cu addition improved both the OSC value and its on-set temperature.
ASJC Scopus subject areas
- Physics and Astronomy(all)