Abstract
Oxyfluoride glasses of the composition 0.3SiO2 · 0.15AlO3/2 · (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 characteristics have revealed that, during the phase decomposition induced in fluorosilicate glasses by rareearth ions, these ions gradually pass from the vitreous matrix into nanocrystals of the cubic modification and form, hypothetically, the β-Pb2 − y Cd y Er x F2 + 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.
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