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artículo con referato
"Structural and morphological properties of Ce(1-x)FexO2-δ synthesized by citrate route"
Mariano O. Mazan, Aldo F. Craievich, Emilia B. Halac, Márcia C.A. Fantini, Diego G. Lamas and Susana A. Larrondo
Ceram. Int. 41(10), Part A (2015) 13721-13730
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 solid solutions 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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