Kinetics of Early Stages of Phase Separation in Glasses
of the PbOB₂O₃ System

V. V. Golubkov^a,* and V. L. Stolyarova^b

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

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

^bFaculty of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504 Russia

Received November 10, 2010

Abstract—Kinetics of changes in sizes of phase regions and volumes at the early stages of the phase separation
of glasses in the PbO–B₂O₃ system has been studied using small-angle X-ray scattering (SAXS). The existence
of the interval of heating durations in which the changes in the sizes of the phase regions and volumes are small
so that it is possible to approximately consider that the structure is in a relatively stable state has been experi-
mentally established. The relative phase volumes and compositions in glasses of the studied system are close
to the equilibrium ones already for the sizes (radii) of the regions of the separated phase of about 15–20Å and
the Ostwald ripening (coalescence) stage begins. Maxima due to the interparticle interference have been
observed in the angular dependences of the SAXS intensities. This indicates ordering in the distribution of the
phase regions.

Keywords: phase separation, structure, small-angle X-ray scattering, coalescence

DOI: 10.1134/S1087659611030047

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