The aquiet Goldschmidtaaa mechanochemical, thermoanalytical, and spectroscopic study of selected steps of the aluminothermic reaction

The Goldschmidt reaction (2Al+I--Fe2O3) was investigated both under mechanical and thermal activation by employing a combination of analytical methods such as ESR and Mossbauer spectroscopy, magnetic susceptibility, X-ray powder diffraction, and thermal analysis (TA). Both the mechanical treatment a...

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Bibliographic Details
Published in:Journal of solid state chemistry 2013-06, Vol.202, p.173-190
Main Authors: StoAer, R, Feist, M, Willgeroth, C, Emmerling, F, Menzel, M, Reuther, H
Format: Article
Language:English
Subjects:
Aluminothermic reactions
Aluminum
Diffraction
Gas phases
Magnetic permeability
Mossbauer spectroscopy
Tantalum
Thermal analysis
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Summary:The Goldschmidt reaction (2Al+I--Fe2O3) was investigated both under mechanical and thermal activation by employing a combination of analytical methods such as ESR and Mossbauer spectroscopy, magnetic susceptibility, X-ray powder diffraction, and thermal analysis (TA). Both the mechanical treatment and the TA runs under air caused the reaction conditions of aquiet redox reactionsa due to a retarding effect and enabled a reaction study in a aslow motion modea. This allowed to establish distinct partial steps of the integral reaction process depending on the intensity of the mechanical impact, the educt composition, the gas phase composition, and, finally, the thermal excitation in the TA runs. Particular attention was payed to the role of the gas phase and to the reaction of aluminum with differently activated oxygen species. The phlegmatizing effect was traced back to the formation of Al2O3 coverages of the Al particles.
ISSN:0022-4596
DOI:10.1016/j.jssc.2013.02.032