Light scattering by sodium germanate glass after temperature jumps in the glass transition range

The time dependences of polarized and depolarized components of the integrated light scattering intensity for sodium germanate glass containing 12.5 mol % sodium oxide are experimentally obtained after temperature jumps in the glass transition range. It is revealed that the light scattering intensity remains virtually unchanged during the low-temperature stabilization preceding a temperature jump. It is found that, after the temperature jump to a larger value, the time dependence of the scattering intensity exhibits a peak. The intensity at a peak and its location on the time scale depend on the duration of preceding low-temperature stabilization. The observed effect is predominantly determined by the behavior of the isotropic component of scattered radiation.