Crystallization of Se-As glasses in ultrasonic field according to optical transmission data

Abstract

The effect of treatment in an ultrasonic cavitation field on the optical transmission of Se-As (0- 5% As) glasses is studied at temperatures somewhat above the glass transition temperature T g . The formation of crystalline centers of nucleation in the glass matrix is estimated by the change in the optical transmission spectra T(ω) in the interval of ω = 400-5000 cm -1 from the following parameters: the transparency value T = T(1000 cm -1 ) and the relative intensity of the specific 630, 790, 3420, and 3620 cm -1 bands. An anisotropic (along the transmission direction) and nonlinear (in composition) change in all optical parameters as a result of ultrasonic treatment different from the effect of spontaneous crystallization during aging is revealed. The results are discussed in terms of synergetics, when glass is considered as a selforganizing system with the characteristic instability of chemical bonding owing to the formation of alternative hypervalent configura� tions. The ultrasonic cavitation field is considered as an exciting medium and/or information field giving the direction of the evolution of this system.