Characterization of vapors evolved during high-temperature syntheses

TL;DRAbstract

Self-propagating high-temperature combustion syntheses (SHS) involve direct reaction between condensed phase reagents. The complexity of the reaction mechanism may be increased, however, by the occurrence of solid-vapor or appreciable gas-phase side reactions. Under certain conditions of pressure and reaction temperature these gas phase reactions may play an important role in the overall mechanism of the SHS reaction. Assays of typical starting reagents show the presence of a number of impurities having wide ranges of concentrations. These impurities include condensed-phase metals and non-metals as well as dissolved gases. The major question concerning these impurities is the degree to which they are involved in the overall reaction mechanism. It is believed that certain impurities form volatile products at the reaction temperature and are removed by vaporization. The goal of this work is to obtain a fundamental understanding of the interplay between impurity removal by volatilization

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