Spectroscopic study of structural modifications in crystalline silica

Spectroscopical investigations of the radiation-induced structural phase transition in crystalline silica (alpha-quartz) irradiated by various doses of fast neutrons have been carried out. The optical methods of reflectance IR and Raman spectroscopy and the X-ray diffraction method have been used. The comparison with the X-ray spectroscopy data on certain parameters and with the Raman spectra obtained at silica heating has been done. The correlation between relevant dependences has ben found. The conclusion has been made about the appearance, at the definite stage of the irradiation by fast neutrons, of the state similar to he high-temperature structural modification of quartz