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Optical-temperature investigations of stationary and photo-induced absorption in undoped and Al (or Ga) doped Bi12SiO20 crystals are discussed. In the wave-number range 22000–4000 cm−1 under temperatures from 80 to 650 K, peculiarities of thermochromic effect have been revealed and temperature dependences of intensity of bands forming photoand thermochromic effects have been found. A correlation between these dependences and spectra of thermostimulated current is explained.

Thermochromic Effect in Doped Bi12SiO20Crystals