Abstract
Optical absorption of Bi12SiO20 crystals containing nonstoichiometry defects in the cation sublattices was studied in the temperature range 80 ÷ 600 K. It is shown that, at absorption coefficients the Urbach rule is fulfilled; while at indirect transitions with the participation of optical phonons take place. The value αt depends on temperature. The parameters of the Urbach rule change regularly when the Bi:Si stoichiometry is violated. The features of the isoabsorption dependences and the parameter σ characterizing the temperature change of the edge absorption are revealed.
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