RT Journal Article
T1 Relationship between the Structure and Transport Properties in the Ce1−xLaxO2−x/2 System
A1 Zamudio-García, Javier
A1 Porras-Vázquez, José Manuel
A1 Canales-Vázquez, J.
A1 Cabeza-Díaz, Aurelio
A1 Losilla, Enrique R.
A1 Marrero-López, David
K1 Pilas de combustible
K1 Catalizadores
AB La-doped CeO2 materials have been widely investigated for potentialapplications in different high-temperature electrochemical devices, such as fuel cells andceramic membranes for hydrogen production. However, the crystal structure is stillcontroversial, and different models based on fluorite, pyrochlore, and/or type-Cstructures have been considered, depending on the lanthanum content and synthesismethod 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 electricalproperties demonstrate that the materials with x ≥ 0.4 are oxide ion proton conductors inan oxidizing atmosphere and mixed ionic electronic conductors in a reducingatmosphere. The water uptake and proton conductivity increase gradually with the increase in La content, suggesting thatthe formation of the C-type phase is responsible for the proton conduction in these materials.
PB American Chemical Society
YR 2019
FD 2019-06-25
LK https://hdl.handle.net/10630/20991
UL https://hdl.handle.net/10630/20991
LA eng
NO Zamudio-García, J., Porras-Vázquez, J., Canales-Vázquez, J., Cabeza, A., Losilla, E., & Marrero-López, D. (2019). Relationship between the Structure and Transport Properties in the Ce1–xLaxO2–x/2 System. Inorganic Chemistry, 58(14), 9368–9377. https://doi.org/10.1021/acs.inorgchem.9b01104
NO MINECO (RTI2018-093735-B-I00 y MAT2016-77648-R)
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026