Nonstoichiometry of Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9{minus}x}
Journal Article
·
· Journal of the Electrochemical Society
- Yokohama National Univ. (Japan). Inst. of Environmental Science and Technology
- Univ. of Tokyo (Japan). Faculty of Arts and Sciences
Oxygen nonstoichiometry of Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9{minus}x} was gravimetrically measured at temperatures from 700 to 1,000 C and oxygen partial pressures between 10{sup {minus}24} and 1 atm. Based on the experimental data, the relationship between log x and log p{sub O{sub 2}}, (where x is the oxygen deficiency and p{sub O{sub 2}} the oxygen partial pressure) is discussed and partial molar enthalpy, {Delta}{bar H}{sub O}, and entropy, {Delta}{bar S}{sub O}, of oxygen are calculated. In the region of x {le} 0.04, x is proportional to the {minus}1/4 power of p{sub O{sub 2}} and {Delta}{bar H}{sub O}, and {Delta}{bar S}{sub O}, behave as in an ideal solution, showing that oxygen vacancies are doubly charged and defects in Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9{minus}x} are randomly distributed. Thus, the mass action law is satisfied in the area x {le} 0.04.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 564117
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 11 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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