Abstract
Our model explaining and predicting generation of a temporal electric potential during nitridation of a single metal particle has been modified to take into account the surface emission of the electrons trapped by defects at deep energy levels. The model estimates have shown that the emission is a highly thermally activated process and its characteristic time correlates with that of the maximum particle temperature. One may neglect the emission at low particle temperatures: during the initial combustion stage or during all the combustion at the sufficiently high rates of heat removal and/or thick initial nitride shell. At the parameters considered the emission exerts no influence on the particle temperature, concentrations of neutral nitrogen interstitials, the reaction rate and other anelectric values. Nevertheless, it greatly affects the surface concentrations of electron holes and electric potential. An increase in the emission intensity leads to a non-equilibrium and formation of the second concentration maximum of the holes as well as to a switch in the potential polarity.
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