Structural and morphological properties of Ce(1−x)FexO2−δ synthesized by citrate route
Cerium-based materials were intensively studied in last years because of their high oxygen storage capacity (OSC) associated to the reversible Ce4+ Ce3+ process and their properties closely related to the defect chemistry that could be adjusted by adequate selection of dopant. Fe3+ cation, due to it...
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| Autores principales: | , , , , , |
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| Formato: | publishedVersion Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2015
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| Materias: | |
| Acceso en línea: | https://ri.unsam.edu.ar/handle/123456789/950 |
| Aporte de: |
| Sumario: | Cerium-based materials were intensively studied in last years because of their high oxygen storage capacity (OSC) associated to the reversible Ce4+ Ce3+ process and their properties closely related to the defect chemistry that could be adjusted by adequate selection of dopant. Fe3+ cation, due to its effective ionic radius smaller than that of Ce4+, is an interesting doping agent. In this work we present the synthesis and characterization of Ce(1-x)FexO2-δ mixed oxides (0<x<1) synthesized by the so named ?citrate method?. Our X-ray diffraction results suggest a rather strong dependence of lattice parameter on nanocrystal size, while Raman spectroscopy evidenced the formation of a small volume fraction of hematite clusters in samples with relatively high iron content, x>0.15, not observable in X-ray diffraction experiments. The solidsolutions exhibit high porosity and specific surface area, with nearly 10% of pore volume in the micropore size range, making these materials potentially useful for applications in catalysis. |
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