Temperature-resolved synchrotron X-ray diffraction of nanocrystalline titania in solvent: the effect of Cr–Sb and V–Sb doping
| Autor: | Giuseppe Valentino Baldi, Giada Lorenzi, Guido Maria Cruciani, Andrea Barzanti, Michele Dondi, Carlo Meneghini, Federico Matteucci, Maria Chiara Dalconi |
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| Přispěvatelé: | Cruciani, G, Dalconi, Mc, Dondi, M, Meneghini, Carlo, Matteucci, F, Barzanti, A, Lorenzi, G, Baldi, G., Cruciani, GUIDO MARIA, Dalconi, M. C., Dondi, M., Matteucci, Federico, Barzanti, A., Lorenzi, G., Baldi, GIUSEPPE VALENTINO |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Pigments
Anatase Materials science X-ray-diffraction Analytical chemistry Bioengineering Synthesis General Materials Science Nanocrystalline materials Synchrotron radiation Brookite X-ray diffraction Phase transformation kinetics Crystal growth Doping General Chemistry Condensed Matter Physics Atomic and Molecular Physics and Optics Nanocrystalline material Crystallography Rutile Modeling and Simulation visual_art X-ray crystallography visual_art.visual_art_medium Particle size Crystallite |
| Zdroj: | Journal of nanoparticle research 13 (2011): 711–719. doi:10.1007/s11051-010-0069-1 info:cnr-pdr/source/autori:Dondi, Michele (1); MATTEUCCI, FRANCESCO (5); MENEGHINI, CARLO (6); Baldi, Giovanni (4); Lorenzi, Giada (3); Cruciani, Giuseppe (2); Dalconi, Maria Chiara (2); Barzanti, Andrea (4)/titolo:Temperature-resolved synchrotron X-ray diffraction of nanocrystalline titania in solvent: the effect of Cr-Sb and V-Sb doping/doi:10.1007%2Fs11051-010-0069-1/rivista:Journal of nanoparticle research/anno:2011/pagina_da:711/pagina_a:719/intervallo_pagine:711–719/volume:13 |
| DOI: | 10.1007/s11051-010-0069-1 |
| Popis: | Nanocrystalline titania pigments were produced by high temperature-forced hydrolysis in a coordinating high-boiling solvent (and water for reference). The effect of synthesis conditions and co-doping with Cr–Sb and V–Sb on particle size and anatase-to-rutile transformation (A → R) was studied by temperature-resolved synchrotron X-ray diffraction. The experiments were performed directly on low concentration (3.5 vol.%) as-synthesized suspensions of titania nanoparticles (up to 230 °C) and on the corresponding dried powders (up to 950 °C). Crystallite size of as-synthesized nano-anatase is around 20 nm (glycol) or 70 nm (water); it exhibits a slow growth rate up to the onset temperature of the A → R. Phase composition and crystallite size are drastically influenced by both synthesis conditions and doping. Synthesis in water resulted in the simultaneous occurrence of anatase and brookite; transformation into rutile begins early but with a slower rate with respect to glycol-based samples. Doping affected the A → R, whose onset temperature in undoped titania (700 °C) was lowered to 650 °C (V–Sb) or prevented up to 950 °C (Cr–Sb). Both (V–Sb) and (Cr–Sb) dopings reduced the volume thermal expansion rate of anatase. |
| Databáze: | OpenAIRE |
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