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Characterization of the Aluminas Formed During the Thermal Decomposition of Boehmite by the Rietveld Refinement Method

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Jiménez, Jose A. and Padilla, Isabel and López Delgado, Aurora and Fillali, Laila and López Andrés, Sol (2015) Characterization of the Aluminas Formed During the Thermal Decomposition of Boehmite by the Rietveld Refinement Method. International Journal of Applied Ceramic Technology, 12 . pp. 178-186. ISSN 1546-542X; Essn: 1744-7402

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Official URL: https://doi.org/10.1111/ijac.12283




Abstract

Boehmite synthesized through a sol‐gel route from a nonconventional raw material, as an aluminum waste, was calcined at temperatures between 500 and 1500°C. Quantification of crystalline phases was performed by the Rietveld refinement of the XRD patterns. γ‐Al2O3 is formed at 500°C, and up to 1000°C, is the dominant phase. At temperatures ranging from 1000 to 1400°C, it was observed the appearance of a four‐phase region. The complete transformation into α‐Al2O3 lasts until 12 h at 1400°C or at higher temperatures. The presence of an amorphous phase in calcined samples was confined by direct comparison with a standard of pure α‐Al2O3.

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Item Type:Article
Subjects:Sciences > Geology > Mineralogy
Sciences > Geology > Petrology
ID Code:62243
Deposited On:23 Sep 2020 10:53
Last Modified:23 Sep 2020 11:22

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