Abstract
A QEXAFS (quick‐scanning EXAFS) technique has been explored to monitor the site specific chemistry and local coordination changes about selected reactants in a class of highly exothermic SHS (Self‐propagating High temperature Synthesis) reactions. Real time EXAFS measurements during the reaction were made in the time frame of a few seconds. By tuning the monochromator to a specific energy at which maximum changes occur in an EXAFS feature of an element from the reactant phase to the product, a time resolution down to 20 ms was achieved. The Ni+Al→NiAl reaction has been investigated in some detail in light of a possible intermediate phase in the so‐called ‘‘after‐burn’’ region.
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