Abstract
Abstract Structure and composition evolution of α-Fe2O3 doped alumina granules during calcination is investigated by means of synchrotron X-ray powder diffraction. The α-Fe2O3 nanoparticles are added to increase the absorption of laser light, however, they also play a significant role in transition kinetics of alumina. It is shown that calcination in air leads to implementation of Fe3+ ions in corundum structure, while calcination in reducing atmosphere leads to creation of metallic iron. Moreover, it is demonstrated that for alumina granules consisting of a mixture of micron-size α-alumina, submicron α-alumina and nano-size γ−/δ--alumina, it is possible to obtain a system composed of two corundum-type structures with different Fe doping levels and the ratio of these two phases can be controlled by calcination temperature.
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