Fluorophosphate Glass of the xBa(PO₃)₂(90x)NaPO₃10AlF₃
System Containing CuCl Nanocrystals

E. V. Kolobkova^a,b, M. Abdelghany^a, and M. M. Sychov^a

^aSt. Petersburg State Institute of Technology, Technical University, Moskovskii pr. 26, St. Petersburg, 190013 Russia

^bITMO University, Birzhevaya liniya 4, St. Petersburg, 199034 Russia

e-mail: kolobok106@rambler.ru

Received February 25, 2015

Abstract—Fluorophosphate glass containing 1.7 mol % of CuCl was synthesized in the xBa(PO₃)₂(90–
x)NaPO₃10AlF₃ 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 transi-
tions.

Keywords: fluorophosphate glass, CuCl nanocrystals, exciton, quantum size effect

DOI: 10.1134/S1087659616020097

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