Relationship between the Structure and Transport Properties
in the Ce1–xLaxO2–x/2 System
Posted on 2019-06-24 - 20:13
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.
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Zamudio-García, Javier; Porras-Vázquez, José Manuel; Canales-Vázquez, Jesús; Cabeza, Aurelio; Losilla, Enrique R.; Marrero-López, David (2019). Relationship between the Structure and Transport Properties
in the Ce1–xLaxO2–x/2 System. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.9b01104
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AUTHORS (6)
JZ
Javier Zamudio-García
JP
José Manuel Porras-Vázquez
JC
Jesús Canales-Vázquez
AC
Aurelio Cabeza
EL
Enrique R. Losilla
DM
David Marrero-López