Structural and morphological properties of Ce(1-x)FexO2-δ synthesized by citrate route

MARIANO MAZÁN; ALDO F. CRAIEVICH; EMILIA B. HALAC; MARCIA C. A. FANTINI; DIEGO G. LAMAS; SUSANA A. LARRONDO

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 41 p. 13721 - 13730

0272-8842

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(1x)FexO2δ mixed oxides(0rxr1) 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, xZ0.15, 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 materialspotentially useful for applications in catalysis.