Fluorinated transition alumina with Al2−x/3O3−xFx compositions: Thermal, chemical, structural and morphological investigations |
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Authors: | M Gaudon J Majimel M Feist A Tressaud |
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Institution: | a Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048-CNRS, 87 Avenue du Docteur Schweitzer, 33608 Pessac, France b Humboldt-University Berlin, Institute of Chemistry, Brook-Taylor-Str. 2, D-12489 Berlin, Germany |
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Abstract: | Fluorinated transition aluminas (Al2−x/3O3−xFx) with hexagonal platelet shape were synthesized via decomposition of α-AlF3 under air; they are thermally stable up to 1000 °C and exhibit at 1150 °C a weight loss with volume reduction caused by fluorine departure corresponding to a phase transition toward corundum alumina. The different characterizations performed in this study are structural (XRD), chemical (TGA-MS and microprobe analysis) and morphological (SEM, TEM and dilatometry). The evidence provided from this study is consistent with the formation of an Al-O-F phase as an intermediate compound in the pyrohydrolysis of an aluminium trifluoride phase to α-Al2O3. |
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Keywords: | Alumina AlF3 Al-O-F Oxide-fluoride |
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