Specific features of the behavior of mixed CuBr-CuCl nanocrystalline phase in a heterogeneous potassium aluminoborosilicate glass

Abstract

The structure of copper halide potassium aluminoborosilicate glasses containing chlorine and bromine is investigated by the small-angle X-ray scattering (SAXS) technique. In the samples heat-treated at temperatures of 520, 550, and 600°C for 24 h, the effective radii of liquid phase regions (at the primary heat treatment temperature) are equal to 64, 96, and 150 a, respectively; and the effective radii of microcrystals of the solid solutions based on copper halides (at room temperature) are 39, 59, and 83 a, respectively. Upon joint introduction of chlorine and bromine, the crystallization temperature decreases down to 100°C. The heat treatment at temperatures above the liquidus point for the copper halide phase brings about an increase in the size of microcrystals of the solid solutions based on copper halides in cooled samples and an increase in the temperatures of melting and crystallization.