Abstract
The mechanism of the solid state displacement reaction NaCl + KF → NaF + KCl was investigated, employing diffusion couples (single crystals), in air at 550°C. The product layer obtained was formed with NaF and (Na, K)Cl solid solution. From cation concentration profiles, photometrically determined, for the NaClz.sfnc;KF and NaCl|KCl systems after annealing at 550°C, and from X-ray diffraction analysis on product layer surfaces for the NaCl|KF system, it was possible to state that the overall process is governed by a cation-counterdiffusion mechanism. A comparison between the diffusion coefficient evaluated through the rate constant and that calculated by means of the Boltzmann-Matano analysis for the system NaClKCl, allows one to deduce that the cations Na + and K + are transported in the (Na, K)Cl solid solution.
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