Effect of X-Rays on Crystal Nucleation in Photostructured
Glasses
of a LithiumSilicate System

G. A. Sycheva, V. V. Golubkov, and T. G. Kostyreva

Grebenshchikov Institute of Silicate Chemisty, Russian Academy of Sciences,
nab. Makarova 2, St. Petersburg, 199034 Russia

e-mail: Sycheva_galina@mail.ru

Received November 29, 2010

Abstract—Crystal nucleation parameters have been determined in a wide range of compositions of photo-
structured glasses of the lithium–silicate system (23.40–45.00 mol % Li₂O) for homogeneous and heteroge-
neous nucleation. The homogeneous nucleation occurred in glasses without photosensitive additives and with
photosensitive gold–silver additives (0.05 wt % above 100%) without irradiation; the heterogeneous nucleation
occurred in glasses with photosensitive gold–silver additives under X-ray irradiation. The ranges of the com-
positions are reported in which the effect of catalyzing irradiation is reversed (suppressing crystallization
according to the autocatalytic mechanism) under certain conditions.

Keywords: photostructured glasses of lithium–silicate system, heterogeneous nucleation on photostructured
Ag and Au impurities, effect of X-rays on crystal nucleation

DOI: 10.1134/S1087659612020101

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