Nonstoichiometry of Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2)

T. Otake; H. Yugami; K. Yashiro; Y. Nigara; T. Kawada; J. Mizusaki

doi:10.1016/S0167-2738(02)00873-1

Nonstoichiometry of Ce_1-XY_XO _2-0.5X-δ (X=0.1, 0.2)

T. Otake, H. Yugami, K. Yashiro, Y. Nigara, T. Kawada, J. Mizusaki

Tohoku University

Research output: Contribution to journal › Article › peer-review

63 Citations (Scopus)

Abstract

Nonstoichiometry of the fluorite-type oxide solid solutions Ce _1-XY_XO_2-0.5X-δ (X=0.1, 0.2) was measured as a function of temperature (T=973-1373 K) and oxygen partial pressure (P(O₂)=10^-2-10^-24 atm) by means of thermogravimetry. The result shows that the nonstoichiometry of Ce _1-XY_XO_2-0.5X-δ (X=0.1, 0.2) is not explained by a simple point defect model, therefore, defect association models are suggested. From the calculation, it is found that (Ce′ _CeV_ÖCe′_Ce)^x is the major defect association not only in Ce_1-XY_XO _2-0.5X-δ (X=0.1, 0.2), but also in pure CeO₂ for nonstoichiometries less than 0.10. It is also found that the defect association (Ce′_CeV_ÖCe′_Ce)^x is dominating at lower temperature and smaller X composition.

Original language	English
Pages (from-to)	181-186
Number of pages	6
Journal	Solid State Ionics
Volume	161
Issue number	1-2
DOIs	https://doi.org/10.1016/S0167-2738(02)00873-1
Publication status	Published - 2003 Jul

Keywords

CeO-YO
Chemical compound
Defect association
Doped-ceria
Nonstoichiometry
Thermogravimetry
YDC

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10.1016/S0167-2738(02)00873-1

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title = "Nonstoichiometry of Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2)",

abstract = "Nonstoichiometry of the fluorite-type oxide solid solutions Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) was measured as a function of temperature (T=973-1373 K) and oxygen partial pressure (P(O2)=10-2-10-24 atm) by means of thermogravimetry. The result shows that the nonstoichiometry of Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) is not explained by a simple point defect model, therefore, defect association models are suggested. From the calculation, it is found that (Ce′ CeV{\"O}Ce′Ce)x is the major defect association not only in Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2), but also in pure CeO2 for nonstoichiometries less than 0.10. It is also found that the defect association (Ce′CeV{\"O}Ce′Ce)x is dominating at lower temperature and smaller X composition.",

keywords = "CeO-YO, Chemical compound, Defect association, Doped-ceria, Nonstoichiometry, Thermogravimetry, YDC",

author = "T. Otake and H. Yugami and K. Yashiro and Y. Nigara and T. Kawada and J. Mizusaki",

year = "2003",

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doi = "10.1016/S0167-2738(02)00873-1",

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T1 - Nonstoichiometry of Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2)

AU - Otake, T.

AU - Yugami, H.

AU - Yashiro, K.

AU - Nigara, Y.

AU - Kawada, T.

AU - Mizusaki, J.

PY - 2003/7

Y1 - 2003/7

N2 - Nonstoichiometry of the fluorite-type oxide solid solutions Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) was measured as a function of temperature (T=973-1373 K) and oxygen partial pressure (P(O2)=10-2-10-24 atm) by means of thermogravimetry. The result shows that the nonstoichiometry of Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) is not explained by a simple point defect model, therefore, defect association models are suggested. From the calculation, it is found that (Ce′ CeVÖCe′Ce)x is the major defect association not only in Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2), but also in pure CeO2 for nonstoichiometries less than 0.10. It is also found that the defect association (Ce′CeVÖCe′Ce)x is dominating at lower temperature and smaller X composition.

AB - Nonstoichiometry of the fluorite-type oxide solid solutions Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) was measured as a function of temperature (T=973-1373 K) and oxygen partial pressure (P(O2)=10-2-10-24 atm) by means of thermogravimetry. The result shows that the nonstoichiometry of Ce 1-XYXO2-0.5X-δ (X=0.1, 0.2) is not explained by a simple point defect model, therefore, defect association models are suggested. From the calculation, it is found that (Ce′ CeVÖCe′Ce)x is the major defect association not only in Ce1-XYXO 2-0.5X-δ (X=0.1, 0.2), but also in pure CeO2 for nonstoichiometries less than 0.10. It is also found that the defect association (Ce′CeVÖCe′Ce)x is dominating at lower temperature and smaller X composition.

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Nonstoichiometry of Ce_1-XY_XO _2-0.5X-δ (X=0.1, 0.2)

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Keywords

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