Structural evolution of Bi2O3 prepared by thermal oxidation of bismuth nano-particles
| Autor: | A. J. Salazar-Pérez, R. A. Morales-Luckie, V. Sánchez-Mendieta, F. Ureña-Ñúñez, M. A. Camacho-López, J. Arenas-Alatorre |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Universidad Nacional Autónoma de México UNAM Redalyc-UNAM Universidad Autónoma del Estado de México UAEMEX Redalyc-UAEMEX Superficies y vacío (México) Num.3 Vol.18 |
| Popis: | "Bismuth nano-sized particles were prepared by the chemical reduction method. These particles were characterized by HR-TEM, X-Ray Diffraction and Micro-Raman Spectroscopy. In order to obtain bismuth oxide, the as-obtained bismuth nano-particles were thermally treated in air at various temperatures in the range 100-750 0C during 30 min. The thermally treated samples were studied by Micro-Raman Spectroscopy. Additionally, information on the chemical composition and morphology was obtained by Energy Dispersive Spectroscopy and Scanning Electron Microscopy, respectively. Results show that bismuth nano-particles were oxidized at 100 oC and transformed into three of the five phases of Bi2O3 reported in literature; the obtained phase depends on the annealing temperature. The β-Bi2O3 phase was obtained for 200-300 0C, α-Bi2O3 for 400-600 0C and finally γ-Bi2O3 for 700-750 0C." |
| Databáze: | OpenAIRE |
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