By E. B. Uvarov B.Sc., A.R.C.S., D.I.C., A.R.I.C. (auth.)
Read Online or Download Catalyzed Crystallization of Glass / Katalizirovannaya Kristallizatsiya Stekla / Катализированная Кристаллизация Стекла PDF
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Extra info for Catalyzed Crystallization of Glass / Katalizirovannaya Kristallizatsiya Stekla / Катализированная Кристаллизация Стекла
Electron micrographs of photosensitive glass specimens treated for 3 h at 500 (a) and 550 (b) with different irradiation times. 8 min a b Fig. 5. Structure of two photosensitive glass specimens crystallized by the same procedure, with different irradiation doses. The second specimen (b) is more than twice as strong as the first (a). crystalline phase appears, not found at the same temperatures in specimens which had not been heated up gradually; this is clear from the sharp difference in the particle morphology.
This influence of the conditions in the precrystallization period on the catalyzed crystallization of glass can be explained only if we tum directly to a study of the changes taking place in the glass structure during the precrystallization period. These changes can be noted even at temperatures 150-200 below the softening point and are intensified by rise of temperature while undergoing qualitative alterations. 0 Electron microscope investigation shows that individual microheterogeneities are already present in the original glass (Fig.
The radii of the heterogeneity regions in these glasses are 200 and 160 A, respectively. The low-angle scattering intensity in this last case is the lowest of all the examples given; even in the range of scattering angles between 6 and 12', it does not exceed 8 pulses/min,while the last point (at a scattering angle of about 27') corresponds to an intensity of less than 1 pulse/min. It is quite evident that such low intensity is associated with an evensmaller difference between the electron densities of the chemically heterogeneous regiOns.