Structural and morphological properties of Ce(1−x)FexO2−δ synthesized by citrate route. Issue 10 (December 2015)

• Record Type: Journal Article
• Authors: Mazan, Mariano O.; Craievich, Aldo F.; Halac, Emilia B.; Fantini, Márcia C.A.; Lamas, Diego G.; Larrondo, Susana A.
• Is Part Of: Ceramics international. Volume 41:Issue 10(2015)Part A
• Page Start: 13721
• Page End: 13730
• Publication Date: 2015-12
• Subjects: Citrate synthesis -- Iron doped ceria -- Scanning electron microscopy -- X-ray diffraction -- Raman spectroscopy; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.08.032
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Cerium-based materials were intensively studied in last years because of their high oxygen storage capacity (OSC) associated to the reversible Ce 4+ ↔Ce 3+ process and their properties closely related to the defect chemistry that could be adjusted by adequate selection of dopant. Fe 3+ cation, due to its effective ionic radius smaller than that of Ce 4+, is an interesting doping agent. In this work we present the synthesis and characterization of Ce(1− x ) Fe x O2− 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.