Hysteresis in the temperature dependence of the intensity of light scattering by boron oxide melt in the 300–450°C temperature range

Resumo

It has been found that the temperature dependence of the intensity of the polarized V_v and depolarized H_v components of light scattering by a boron oxide melt in the range of 300–450°C is characterized by the existence of hysteresis: the specific feature of the change in the polarized V_v component is the formation of a minimum, while the specific feature in the behavior of the depolarized H_v component is associated with the appearance of a maximum in the sample heating mode; the cooling mode is accompanied by a monotonic change in the intensity of the light-scattering components. It has been found also that in the process of a low-temperature stabilization of the melt at 300°C, the polarized V_v component after reaching its minimum values increases up to the initial level, while the depolarized H_v component after passing its maximum decreases to the values smaller than the initial one. The characteristic time of the change in the intensity of the V_v component at 300°C is determined; its value was found to be ~100 min. It has been shown that an insignificant change in the melt synthesis conditions affects the detected features of the intensity change in the range of 300–450°C.