The Kinetics of the Formation of CdSe Nanocrystals
in SodiumZincSilica Glass

V. V. Golubkov^a, P. A. Onushchenko^a, and A. A. Onushchenko^b

^aGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034
Russia

^bResearch and Technological Institute of Optical Materials, Vavilov State Optical Institute All-Russian Scientific Center,
ul. Babushkina 36/1, St. Petersburg, 192171 Russia

e-mail: petr.onushchenko@gmail.com

Received June 20, 2013

Abstract—The kinetics of precipitation of CdSe nanocrystals in sodium–zinc–silica glass subjected to a two-
stage heat treatment at different temperatures of the primary and secondary heat treatments has been studied by
small-angle X-ray scattering (SAXS). The primary low-temperature heat treatment is accompanied by the
nucleation of crystallization centers, i.e., supercritical nucleation centers. During the secondary heat treatment,
crystals largely grow on the formed centers. In this case, the crystals are distributed in the bulk of the glass in
a certain order, which apparently results from the regular pattern of distribution of the crystallization centers
formed during the primary heat treatment. It has been found that the precipitated nanocrystals have a narrow
size distribution at all stages of heat treatment. After the completion of precipitation of the crystalline phase, a
stable structure is formed. The crystal sizes and the volume fraction of the phase do not change within the mea-
surement accuracy (1–2%) for the heating times that are at least an order of magnitude longer than the duration
of the precipitation stage.

Keywords: structure, nanocrystals, crystallization, X-ray diffraction

DOI: 10.1134/S1087659614030092

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