Fluorophosphate glass of the xBa(PO3)2 · (90–x)NaPO3 · 10AlF3 system containing CuCl nanocrystals

Abstract

Fluorophosphate glass containing 1.7 mol % of CuCl was synthesized in the xBa(PO₃)₂ · (90–x)NaPO₃ · 10AlF₃ system (mol %). The excess chlorine due to the addition of two different amounts of HCl results in a decrease in glass density indicating the introduction of chlorine in the structure and reduction of the degree of connectivity of the glass network. In glass with a high concentration of chlorine, CuCl nanocrystals with dimensions of about 4–4.6 nm are formed during the heat treatment near the glass transition temperature (T_g); this is registered by the appearance and increase of exciton bands corresponding to the Z_1,2 and Z₃ transitions.