Diffusion of F‐centers in potassium chloride crystals

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Abstract
Diffusion coefficients of F‐centers in additively colored KCI single crystals have been measured as a function of F‐center concentration [F] and temperature. It has been found that up to a certain critical concentration which decreases with temperature, these coefficients are independent of [F]. Above this concentration, diffusion coefficients decrease with [F]. Presence of divalent cations seems to increase diffusion rates. Theoretical analysis of the experimental data indicates, that at low [F], diffusion of F‐centers is controlled by electrons hopping from one vacancy to another. At high [F], the dominant transport mechanism is diffusion of cation vacancies.