Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR
| dc.contributor.author | A. Malki | |
| dc.date.accessioned | 2024-03-21T21:21:32Z | |
| dc.date.available | 2024-03-21T21:21:32Z | |
| dc.date.issued | 2014-03-20 | |
| dc.description.abstract | The changes caused by heat treatment of gibbsite powder at 300–1473 K were studied using the X-ray diffraction (XRD), X-ray photoemission (XPS) spectra and 27Al magic angle spinning nuclear magnetic resonance spectroscopy (27Al MAS NMR). XRD analysis indicates that the transformation sequence involves the formation of κ-Al2O3 as an intermediate phase between χ- and α-Al2O3. The crystallite size of χ-Al2O3 is as small as 10 nm. XPS analysis indicates that the ratio of aluminium atoms to oxygen atoms in χ-Al2O3 and κ-Al2O3 increases, whereas the expected ratio is observed in α-Al2O3. The percentage of AlO4 units in the transition aluminas follows the same behaviour as the ratio of Al/O. | |
| dc.identifier.uri | http://dspace.univ-khenchela.dz:4000/handle/123456789/4435 | |
| dc.language.iso | en | |
| dc.title | Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR | |
| dc.type | Article |
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