A very simple derivation of well-known Mollwo's relation between ionic distance and F maximum absorption frequency is given. Then following Inui and Uemura's idea, the variation in the position and the breadth of F absorption band with temperature is correlated with the variation and the fluctuation in ionic distance by thermal motions. Finally, formula for the concentration of F centers in equilibrium with alkali vapor is given, taking into account the change in vibrational frequency of the positive ions adjacent to F vacancies. Numerical value for the parameter characterizing this change is computed by comparing with experiment the formulas for the temperature dependency of F band and for the concentration of F centers.
No takes yet. Share an insight, caveat, or question.
Takeo Nagamiya (1952) studied this question.