Characterization of the Aluminas Formed During the Thermal Decomposition of Boehmite by the Rietveld Refinement Method. (20th June 2014)

• Record Type: Journal Article
• Authors: Jiménez, Jose A.; Padilla, Isabel; López‐Delgado, Aurora; Fillali, Laila; López‐Andrés, Sol
• Is Part Of: International journal of applied ceramic technology. Volume 12(2015:May/Jun.)Supplement 2
• Page Start: E178
• Page End: E186
• Publication Date: 2014-06-20
• Subjects: Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.12283
• Languages: English
• ISSNs: 1546-542X

Abstract

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‐Al2 O3 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‐Al2 O3 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‐Al2 O3 .