Spectroscopic investigation on the lattice dynamics of different cut quartz samples irradiated by neutrons

A spectroscopic study of the effect of neutron radiation on the lattice dynamics of different cut crystalline and glassy quartz (SiO2) has been performed. The IR spectroscopy method is used to determine the mechanisms by which the spectral characteristics of deformation and valence vibrations vary by radiation-induced alteration of the lattices in two types of modified quartz (α-SiO2 and ν-SiO2) as a function of the neutron fluence at low and high frequencies. It has been established that nonlinear changes in the dose dependences between the spectral characteristics of the fundamental modes occur in two types of crystals, with different orientations, and in glass, and the features of the spectrum modifications exist near 300–550 and 700–1400 cm−1 and at higher frequencies. The derived dose dependences are compared to those of the degenerate vibration parameters in ν-SiO2, and the extreme kinetics of the force coefficients is determined. A conclusion is made that the accumulation of radiation damages, changes in the force field around the bridge bonds, and the phase states of SiO2 affect the observed specific behavior of the radiation-modified spectral and force parameters of the degenerate and deformation modes in quartz samples of different types.

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