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

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 300-450A degrees 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 300A degrees 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 300A degrees C is determined; its value was found to be similar to 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 300-450A degrees C.