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Transition alumina phases induced by heat treatment of boehmite: An X -ray diffraction and infrared spectroscopy study

Boumaza, A. ; Favaro, L. ; Lédion, J. ; Sattonnay, G. ; Brubach, J.B. ; Berthet, P. ; Huntz, A.M. ; Roy, P. ; Tétot, R.

Journal of solid state chemistry, 2009-05, Vol.182 (5), p.1171-1176 [Periódico revisado por pares]

Amsterdam: Elsevier Inc

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Título:
Transition alumina phases induced by heat treatment of boehmite: An X -ray diffraction and infrared spectroscopy study
Autor: Boumaza, A. ; Favaro, L. ; Lédion, J. ; Sattonnay, G. ; Brubach, J.B. ; Berthet, P. ; Huntz, A.M. ; Roy, P. ; Tétot, R.
Assuntos: ABSORPTION SPECTROSCOPY ; Alpha alumina ; ALUMINIUM COMPOUNDS ; ALUMINIUM OXIDES ; Boehmite ; CALCINATION ; CHALCOGENIDES ; CHEMICAL REACTIONS ; COHERENT SCATTERING ; Condensed matter: structure, mechanical and thermal properties ; Crystalline state (including molecular motions in solids) ; Crystallographic aspects of phase transformations; pressure effects ; DECOMPOSITION ; DEHYDRATION ; DIFFRACTION ; Exact sciences and technology ; HEAT TREATMENTS ; INFRARED SPECTRA ; Infrared spectroscopy ; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ; MICROSTRUCTURE ; OXIDATION ; OXIDES ; OXYGEN COMPOUNDS ; Physics ; PYROLYSIS ; SCATTERING ; SPECTRA ; SPECTROSCOPY ; Structure of solids and liquids; crystallography ; Structure of specific crystalline solids ; TEMPERATURE RANGE ; TEMPERATURE RANGE 1000-4000 K ; THERMOCHEMICAL PROCESSES ; THIN FILMS ; Transition aluminas ; X-RAY DIFFRACTION
É parte de: Journal of solid state chemistry, 2009-05, Vol.182 (5), p.1171-1176
Descrição: During high temperature oxidation of alumina-forming alloys, various transition aluminas are formed before reaching the most stable α-Al 2O 3 phase. In particular, the γ, δ and θ transition aluminas are concerned. Precise studies on the development, the microstructure and the properties of the oxide layers are not straightforward owing to the difficulty to unambiguously distinguish the various polymorphs by X-ray diffraction (XRD) alone. To remove this difficulty, we propose a procedure which combines XRD and infrared (IR) spectroscopy. γ, δ, θ and α-Al 2O 3 phases, prepared by dehydration of aluminium oxihydroxide AlOOH (boehmite), were measured by XRD and IR spectroscopy on all samples. Thus, reference IR spectra were obtained for all alumina phases, as well as an assignment of the main band in agreement with previous studies, and coherent with the structural evolution of various polymorphs. This precise characterization may constitute a basis for further investigations on thin layers of alumina formed under various experimental conditions (temperature, atmosphere, etc.). Infrared spectra of alumina sequence γ→ δ→ θ→ α–Al 2O 3 obtained from 24h calcinations of boehmite at 873 K (a), 1123K (b), 1223 K (c), 1273 K (d), 1293 K (e), 1383 K (f), 1573 K (g).
Editor: Amsterdam: Elsevier Inc
Idioma: Inglês

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Transition alumina phases induced by heat treatment of boehmite: An X -ray diffraction and infrared spectroscopy study

Boumaza, A. ; Favaro, L. ; Lédion, J. ; Sattonnay, G. ; Brubach, J.B. ; Berthet, P. ; Huntz, A.M. ; Roy, P. ; Tétot, R.

Amsterdam: Elsevier Inc

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