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- W2953249920 abstract "La-doped CeO2 materials have been widely investigated for potential applications in different high-temperature electrochemical devices, such as fuel cells and ceramic membranes for hydrogen production. However, the crystal structure is still controversial, and different models based on fluorite, pyrochlore, and/or type-C structures have been considered, depending on the lanthanum content and synthesis method used. In this work, an exhaustive structural analysis of the Ce1–xLaxO2–x/2 system (0.2 < x ≤ 0.7) is performed with different techniques. The average crystal structure, studied by conventional X-ray diffraction, could be considered to be a disordered fluorite; however, the local structure, examined by electron diffraction and Raman spectroscopy, reveals a biphasic mixture of fluorite and C-type phases. The thermal and electrical properties demonstrate that the materials with x ≥ 0.4 are oxide ion proton conductors in an oxidizing atmosphere and mixed ionic electronic conductors in a reducing atmosphere. The water uptake and proton conductivity increase gradually with the increase in La content, suggesting that the formation of the C-type phase is responsible for the proton conduction in these materials." @default.
- W2953249920 created "2019-06-27" @default.
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- W2953249920 date "2019-06-25" @default.
- W2953249920 modified "2023-10-17" @default.
- W2953249920 title "Relationship between the Structure and Transport Properties in the Ce<sub>1–<i>x</i></sub>La<sub><i>x</i></sub>O<sub>2–<i>x</i>/2</sub> System" @default.
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- W2953249920 doi "https://doi.org/10.1021/acs.inorgchem.9b01104" @default.
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