Characterization of Cubic Ceria—Zirconia Powders by X-Ray Diffraction and Vibrational and Electronic Spectroscopy
| Autor: | Enrique Fernández López, Marta Panizza, José Manuel Gallardo Amores, Vicente Sanchez Escribano, Carlo Resini, Guido Busca |
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| Rok vydání: | 2004 |
| Předmět: |
Diffraction
Materials science Chemistry Infrared Analytical chemistry Infrared spectroscopy General Chemistry General Medicine Condensed Matter Physics Electron spectroscopy symbols.namesake Tetragonal crystal system X-ray crystallography symbols General Materials Science Cubic zirconia Raman spectroscopy |
| Zdroj: | ChemInform. 35 |
| ISSN: | 1522-2667 0931-7597 |
| DOI: | 10.1002/chin.200406005 |
| Popis: | The X-ray diffraction (XRD) patterns and the Infrared, Raman and UV–visible spectra of CeO 2 ZrO 2 powders prepared by co-precipitation are presented. Raman spectra provide evidence for the largely predominant cubic structure of the powders with CeO 2 molar composition higher than 25%. Also skeletal IR spectra allow to distinguish cubic from tetragonal phases which are instead not easily distinguished on the basis of the XRD patterns. All mixed oxides including pure ceria are strong UV absorbers although also absorb in the violet visible region. By carefully selecting their composition and treatment temperature, the onset of the radiation that they cut off can be chosen in the 425–475 nm interval. Although they are likely metastable, the cubic phases are still pure even after heating at 1173 K for 4 h. |
| Databáze: | OpenAIRE |
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