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-Al 2O3. The percentage of AlO4 units in the transition aluminas follows the same behaviour as the ratio of Al/O.
| Original language | English |
|---|---|
| Pages (from-to) | 8-15 |
| Number of pages | 8 |
| Journal | Journal of Solid State Chemistry |
| Volume | 215 |
| DOIs | |
| Publication status | Published - 1 Jan 2014 |
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Keywords
- Gibbsite
- Transition alumina
- X-ray diffraction
- X-ray photoelectron microscopy
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Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR. / Malki, A.; Mekhalif, Z.; Detriche, S.; Fonder, G.; Boumaza, A.; Djelloul, A.
In: Journal of Solid State Chemistry, Vol. 215, 01.01.2014, p. 8-15.Research output: Contribution to journal › Article
TY - JOUR
T1 - Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR
AU - Malki, A.
AU - Mekhalif, Z.
AU - Detriche, S.
AU - Fonder, G.
AU - Boumaza, A.
AU - Djelloul, A.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - 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-Al 2O3. The percentage of AlO4 units in the transition aluminas follows the same behaviour as the ratio of Al/O.
AB - 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-Al 2O3. The percentage of AlO4 units in the transition aluminas follows the same behaviour as the ratio of Al/O.
KW - Gibbsite
KW - Transition alumina
KW - X-ray diffraction
KW - X-ray photoelectron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84897404107&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2014.03.019
DO - 10.1016/j.jssc.2014.03.019
M3 - Article
AN - SCOPUS:84897404107
VL - 215
SP - 8
EP - 15
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
ER -