Real-time probe of reaction centers in solid combustions on the subsecond time scale
| Autor: | Joe Wong, Bernhard Rupp, R. Frahm, J. B. Holt, E. M. Larson, P. A. Waide |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | Physical review / B 46(14), 9205-9208 (1992). doi:10.1103/PhysRevB.46.9205 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | Physical review / B 46(14), 9205 - 9208 (1992). doi:10.1103/PhysRevB.46.9205 A quick-scanning extended x-ray-absorption fine-structure (QEXAFS) technique has been devised to follow the local atomic coordination changes about selected reactants in a class of highly exothermic solid-combustion reactions. Real-time EXAFS measurements during the combustion 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 transforming from the reactant to the product phase, a time resolution of 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. The present QEXAFS findings together with the recent time-resolved diffraction data on the same system lends experimental insights into the structural macrokinetics of this class of combustion systems. Published by Inst., Woodbury, NY |
| Databáze: | OpenAIRE |
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