Specific Features of the Formation of Oxyfluoride Glass-
Ceramics
in the SiO₂PbF₂CdF₂ZnF₂Al₂O₃Er(Eu, Yb)F₃ System

E. V. Kolobkova*, N. O. Tagil’tseva, and P. A. Lesnikov

St. Petersburg State Institute of Technology (Technical University), Moskovskii pr. 26, St. Petersburg, 190013 Russia

* e-mail: kolobok106@rambler.ru

Received May 14, 2009

Abstract—Oxyfluoride glasses of the composition 0.3SiO₂ 0.15AlO_3/2 (0.29 – z)CdF₂ (0.18 + z)PbF₂
0.05ZnF₂ 0.03Er(Eu, Yb)F₃ and the synthesis of the related glass-ceramic materials have been investigated. It
has been demonstrated that heat treatment of the glasses is accompanied by the formation of a nanosized (16–
25 nm) crystalline phase. X-ray powder diffraction analysis and measurement of spectral–luminescent charac-
teristics have revealed that, during the phase decomposition induced in fluorosilicate glasses by rare-earth ions,
these ions gradually pass from the vitreous matrix into nanocrystals of the cubic modification and form, hypo-
thetically, the -Pb_{2 – y}Cd_yEr_xF_{2 + x} crystalline phase, in which the value of x is constant and equal to 0.2, whereas
the value of y varies from 0 to 0.145 depending on the composition of the initial mixture.

Key words: oxyfluoride glass-ceramics, IR and luminescence spectra, phase decomposition, nanocrystals

DOI: 10.1134/S1087659610030089

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