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- W4230308076 abstract "Abstract Earlier studies have shown a strong correlation between the enthalpy of formation, Δ H f,ox , and the ionic conductivity, σ i , near room temperature in doped ceria systems, which are promising solid electrolytes for intermediate‐temperature solid oxide fuel cells (IT‐SOFCs). The present work demonstrates that this correlation holds at the operating temperature of IT‐SOFCs, 600–700 °C. Solid solutions of Ce 1− x Nd x O 2−0.5 x , Ce 1− x Sm x O 2−0.5 x , and Ce 1− x Sm 0.5 x Nd 0.5 x O 2−0.5 x are studied. The Δ H f,ox at 702 °C is determined by considering the excess heat content between 25 and 702 °C combined with the value of Δ H f,ox at 25 °C. Both σ i and Δ H f,ox show maxima at x= 0.15 and 0.20 for the singly and doubly doped ceria, respectively, suggesting that the number of mobile oxygen vacancies in these solid solutions reaches a maximum near those compositions. An increase in temperature results in a shift of the maximum in both Δ H f,ox and σ i towards higher concentrations. This shift results from a gradual increase in dissociation of the defect associates." @default.
- W4230308076 created "2022-05-11" @default.
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- W4230308076 date "2014-07-09" @default.
- W4230308076 modified "2023-10-18" @default.
- W4230308076 title "Defect Chemistry of Singly and Doubly Doped Ceria: Correlation between Ion Transport and Energetics" @default.
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- W4230308076 doi "https://doi.org/10.1002/ange.201404618" @default.
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