Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
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https://doi.org/10.1111/ijac.13295 |
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Título
Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion methodAutoría
Fecha de publicación
2019-05Editor
American Ceramic Society; WileyCita bibliográfica
CRUZ‐PACHECO, Andrés F., et al. Effect of Pr on the electrical and chemical properties of cerium oxide prepared by combustion method. International Journal of Applied Ceramic Technology. Int J Appl Ceram Technol. 2019;00:1–11.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/ijac.13295Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Nanoparticles of Ce1−xPrxO2 (X: 0.6 and 0.8), were synthesized by the combustion method using citric acid as chelating and fuel agent. The X‐ray diffraction patterns and Rietveld refinements confirm that samples ... [+]
Nanoparticles of Ce1−xPrxO2 (X: 0.6 and 0.8), were synthesized by the combustion method using citric acid as chelating and fuel agent. The X‐ray diffraction patterns and Rietveld refinements confirm that samples shown as a single phase in a cubic fluorite structure, with an increase in the lattice parameter as a function of Pr con-centration. The crystallite size domains obtained by the Scherrer formula, confirm values around 10 and 37 nm. The scanning electron microscopy images, show that the solids are composed of dense heterogeneous aggregates. The X‐ray photoelectron spectroscopy, reveals that oxides are composed of cerium and praseodymium cations in oxidation states 4+ and 3+ respectively. The TPR‐H2 profiles indicate that cerium and praseodymium cations present in the obtained systems are completely reduced to Ce3+ and Pr3+ at temperatures above 790°C. The impedance spectroscopy data at room temperature showed that the conduction processes for the two systems take place at the grain boundaries. The Ce0.2Pr0.8O2 system offer lower resistance, due to the high amount of Pr3+ ions inserted in the structure and the high amount of oxygen vacancies formed in the synthesis process. [-]
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