Publisher： John Wiley & Sons Inc
E-ISSN： 1744-7402|12|S2|E178-E186
ISSN： 1546-542x
Source： INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY, Vol.12, Iss.S2, 2015-05, pp. : E178-E186
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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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