Abstract
Cation-ordered κ-Ce2Zr2O8 exhibits a high oxygen storage/release capacity (OSC); however, the cation-ordered phase transforms into a cation-disordered phase during high-temperature calcination, thereby decreasing the OSC. Ti substitution in Ce0.5Zr0.4Ti0.1O2 facilitates the formation of a cation-ordered structure compared to the conventional κ-Ce2Zr2O8, which requires a high-temperature reduction treatment to obtain an ordered structure. In this study, the thermal stabilities of Ce0.5Zr0.4Ti0.1O2 and κ-Ce2Zr2O8 are compared. Powder X-ray diffraction reveals that the onset temperature for the cation disordering of Ce0.5Zr0.4Ti0.1O2 (700 °C) is lower than that of κ-Ce2Zr2O8 (1000 °C). Furthermore, scanning transmission electron microscopy suggests that the cation disordering of Ce0.5Zr0.4Ti0.1O2 is induced by the high mobility of Ti within the crystal lattice; thus, the OSC decreases and κ-Ce2Zr2O8 exhibits a higher thermal stability than Ce0.5Zr0.4Ti0.1O2. Hence, Ti substitution facilitates the formation of a cation-ordered structure; however, it stimulates cation disordering that lowers the OSC and reduces thermal stability.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
