Abstract
AbstractThe electrolytic coloration process is employed to obtain the mobility of F‐centers in KI, KBr, KCl, and NaCl crystals by measuring the drift velocity of the color cloud, during its withdrawal as function of temperature. The motion of the color cloud is timed between two previously marked lines and the field was also measured between them. An optical arrangement is used to project the crystal on a screen. The thermal dissociation energy EF is deduced for all these crystals which comes out to be 2.33, 2.66, 2.88, and 2.45 eV for KI, KBr, KCl, and NaCl crystals, respectively. The variation of the ratio of the fields (Uun/Ucol) in the colored and uncolored regions is also studied with temperature. A Mollwo‐Ivey type of relation is also tried between EF and various physical properties of the crystals, from the extrapolation of which the hS value for NaI is deduced which agrees very well with the reported value, where hS is the Schottky defect formation energy.
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