Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 8, Pages 11072-11079Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.12.230
Keywords
Ceria; Zirconia; Yttria; Thermodynamic properties; SOFC; Knudsen effusion mass spectrometry
Categories
Funding
- Saint Petersburg Committee on Science and High School grant
- [75152019210]
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Ceria-based solid solutions have insufficient stability at high temperatures, which hinders their applications in electrochemical fields. Investigating the thermal histories and vaporization processes of Y2O3-CeO2 and Y2O3-ZrO2-CeO2 solid solutions revealed that the reduction of Ce4+ to Ce3+ affects the Gibbs energy.
Ceria-based solid solutions are important materials for high-and medium-temperature electrochemical applications. However, the stabilities of both binary and ternary ceria-based solid solutions are insufficient at elevated temperatures, which limits their application as solid electrolytes or SOFC cathodes. Data on the high-temperature stability of ceria-based ceramics are unavailable in the literature. In the present study, we report a thermodynamic stability investigation of Y2O3-CeO2 and Y2O3-ZrO2-CeO2 solid solutions. The thermal prehistories of binary and ternary systems were investigated using STA, XRD, and ESCA techniques. The vaporization processes were investigated in the temperature range of 1577-2227 degrees C via the Knudsen effusion mass spectrometry technique. Using data on the component activity in solid-phase thermodynamic properties of Y2O3-CeO2 solid solutions, which is represented as the Gibbs energy, the excess Gibbs energy was calculated as a function of the ceria mol. %. It was shown that the reduction of Ce4+ to Ce3+ in Y2O3-CeO2 and Y2O3-ZrO2-CeO2 solid solutions corresponds to less-negative Gibbs energy compared to ZrO2-CeO2 solid solutions.
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