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An efficient solution for the single-step synthesis of 4CaO·Al2O3·Fe2O3 powders

Published online by Cambridge University Press:  31 January 2011

Robert Ianoş
Robert Ianoş*
Affiliation:
“Politehnica” University of Timişoara, Faculty of Industrial Chemistry and Environmental Engineering, Timişoara 300006, Romania
*
a) Address all correspondence to this author. e-mail: robert_ianos@yahoo.com
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Abstract

Single-phase nanocrystalline 4CaO·Al2O3·Fe2O3 powders were prepared directly from the combustion reaction using a new cost-effective, time-saving, and environmentally friendly version of solution combustion synthesis. Instead of a single fuel, a fuel mixture of urea and β-alanine was used. It was shown by x-ray diffraction, energy-dispersive x-ray analysis, thermogravimetric analysis, and optical microscopy that this new version of the solution combustion synthesis allows the maximization of the exothermic effect associated with the combustion reaction. On the other hand, it was shown that the traditional version of combustion synthesis involving the use of a single fuel, such as urea or β-alanine, does not ensure the formation of Ca4Al2Fe2O10 unless subsequent thermal treatments are applied. It was suggested that the occurrence of combustion reactions cannot be regarded only in terms of adiabatic temperature, as the kinetic aspects overrule the thermodynamic ones.

Keywords

CeramicCombustion synthesisX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 1 , January 2009 , pp. 245 - 252
Copyright
Copyright © Materials Research Society 2009

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