Thermochromic Effect in Doped Bi12SiO20Crystals

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 photo-and thermochromic effects have been found.A correlation between these dependences and spectra of thermostimulated current is explained.