Peculiarities of light scattering by boron oxide glass

Resumo

The data on changes in light scattering intensity with time at 330°C after stabilization of the sample at 200°C were obtained using the temperature jump method. It was found that the time dependence of the polarized component at 330°C can be divided into two stages. The first stage involves the initial times and is characterized by the formation of the maximum, which corresponds to the universal effect caused by the emergence of a peak of intensity in the glass-transition interval of oxide glass. The second stage is associated with a decrease in intensities with the characteristic times being significantly longer than the structural relaxation times. The anisotropic scattering intensity was found to increase during low-temperature stabilization at 200°C, while the isotropic scattering intensity remained constant. The behavior of intensity became nonergodic as a result of the long-term heating of the sample: the intensity started to depend on the position of the scattering volume. It was demonstrated that the shape of the fleck from the primary light beam that has passed through the sample can be significantly changed and acquire a speckle structure. A hypothesis was put forward that the detected features in the behavior of light scattering intensity are associated with the development of large-scale structures in the glass volume.