Phase Transformations in Sodium Zinc Silicate Glasses
Containing PbS Nanocrystals

I. P. Alekseeva^a, V. V. Golubkov^b, *, and A. A. Onushchenko^a

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

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

*e-mail: golubkov@isc1.nw.ru

Received January 13, 2010

Abstract—The phase composition and the kinetics of formation of the lead sulfide crystalline phase at the late
stages of heat treatments of sodium zinc silicate glasses have been investigated using small-angle X-ray scat-
tering and X-ray powder diffraction. It has been established that, after the completion of the precipitation of the
PbS crystalline phase, the reaction PbS + ZnO = PbO + ZnS begins to proceed on the surface of nanocrystals.
This reaction results in a decrease in the volume of the PbS phase and the precipitation of ZnS nanocrystals.
The size effect has been revealed: PbS nanocrystals with a radius larger than approximately 70 Å are stable,
whereas nanocrystals with smaller sizes initiate the reaction PbS + ZnO = PbO + ZnS.

Key words: structure, nanocrystals, crystallization, X-ray diffraction

DOI: 10.1134/S1087659610040024

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