Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Thermal prehistory, structure and high-temperature thermodynamic properties of Y2O3-CeO2 and Y2O3-ZrO2-CeO2 solid solutions. / Kurapova, Olga Yu; Shugurov, Sergey M.; Vasil'eva, Evgenia A.; Savelev, Daniil A.; Konakov, Vladimir G.; Lopatin, Sergey I.
в: Ceramics International, 30.12.2020.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Thermal prehistory, structure and high-temperature thermodynamic properties of Y2O3-CeO2 and Y2O3-ZrO2-CeO2 solid solutions
AU - Kurapova, Olga Yu
AU - Shugurov, Sergey M.
AU - Vasil'eva, Evgenia A.
AU - Savelev, Daniil A.
AU - Konakov, Vladimir G.
AU - Lopatin, Sergey I.
N1 - Funding Information: This research work was supported by the President's grant for young scientists (research project 75-15-2019-210). The DSC and ESCA data were obtained at the Research park of St. Petersburg State University by the Center for Thermogravimetric and Calorimetric Research and the Center for Studies in Surface Science, respectively. The language editing service was supported by Saint Petersburg Committee on Science and High School grant for young scientists. Publisher Copyright: © 2020 Elsevier Ltd and Techna Group S.r.l. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/12/30
Y1 - 2020/12/30
N2 - 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°С 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.
AB - 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°С 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.
KW - Ceria
KW - Knudsen effusion mass spectrometry
KW - SOFC
KW - Thermodynamic properties
KW - Yttria
KW - Zirconia
UR - http://www.scopus.com/inward/record.url?scp=85098600900&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/b03516db-f299-32d3-800f-0408eaf39b75/
U2 - 10.1016/j.ceramint.2020.12.230
DO - 10.1016/j.ceramint.2020.12.230
M3 - Article
AN - SCOPUS:85098600900
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
ER -
ID: 72792987