Spectral dependences of optical absorption for vacuum annealed Bi12SiO20 crystals

M.G. Kisteneva, A.S. Akrestina, E.S. Khudyakova, A.N. Grebenchukov, S.M. Shandarov, and Yu.F. Kargin

State University of Control System and Radioelect , Russia

We have investigated the spectral dependences of the optical absorption of Bi12SiO20 crystals, subjected to vacuum annealing in the temperature range from 650 to 780