Abstract
The steady-state and photoinduced absorption spectra of Bi12SiO20 crystals doped with molybdenum are investigated. It is demonstrated that the impurity absorption is associated with the Mo6+ and Mo5+ ions occupying the positions close to the tetrahedral Si4+ position. The mechanism of the photochromic effect is proposed. This mechanism involves the change in the charge state of molybdenum impurity ions according to the scheme MoSi6+ + e− → MoSi5+.
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