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| Title: | CERIA-ZIRCONIA-ALUMINA MIXED OXIDES PREPARED BY THE ORGANIC-FREE SOL-GEL TECHNIQUE | |
| DOI No: | 10.1142/9789812701879_0042 | |
| Source: | CLUSTERS AND NANO-ASSEMBLIES (pp 363-369) | |
| Author(s): | E. FROLOVA
Research Institute for Physical Chemical Problems, BSU, Minsk, Belarus M. IVANOVSKAYA Research Institute for Physical Chemical Problems, BSU, Minsk, Belarus V. PETRANOVSKII CCMC, UNAM, Ensenada, B.C. 22800, Mexico S. FUENTES CCMC, UNAM, Ensenada, B.C. 22800, Mexico E. TYAVLOVSKAYA Institute of Electronics, National Academy of Sciences of Belarus, Minsk, Belarus |
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| Abstract: | The structural composition and the cause of the thermal stability of the obtained structure in the Ce:Zr:Al (7.5:7.5:85 molar ratio) oxides nanosystem, prepared by the organic-free sol-gel technique were investigated by XRD, FTIR and XPS. According to the XRD analysis, the Ce:Zr:Al sample calcined at 1100 °C in air, presents a nanosystem with dispersion of C-ZrXCe1-XO2 S.S.(~10 nm) nanoparticles in nanocrystalline γ-Al2O3 (~4 nm) matrix. This system remained stable during further heating up to 1200°C during 8 h in air. A strong chemical interaction between the components of ceria-zirconia nanoparticles on the phase boundary with alumina matrix with formation of charge transfer complexes [Zrn+δ - O - Alm-δ] and [Cen+δ - O - Alm-δ] could explain the quenching of nanocrystalline state in this system, that "freeze" crystallization even at high temperatures. | |
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