Estimation of the intrinsic stresses in a-alumina in relation with its elaboration mode
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2010-06-06
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Abstract
The specific signatures of a-Al2O3 by Fourier transform infrared (FTIR) spectroscopy were investigated
to estimate the intrinsic stress in this compound according to its elaboration mode. Thus, a-alumina
was prepared either by calcination of boehmite or gibbsite and also generated by oxidation of a metallic
FeCrAl alloy. FTIR results were mainly supported by X-ray diffraction (XRD) patterns that allowed to
determine the crystallite size and the strain in the various alpha aluminas. Moreover, the infrared peak
at 378.7 cmÿ1 was used as a reference for stress free a-alumina and the shift of this peak allowed to
estimate intrinsic stresses, which were related to the morphology and to the specific surface area of
aluminas according to their elaboration mode. These interpretations were confirmed by results
obtained by cathodoluminescence experiments.