A new theoretical approach, based on the oscillations sometimes observed in the Porod plot, has been used to estimate particle sizes in phase separated glasses. We have studied the demixing kinetics consequent upon appropriate isothermal heating of the glasses of the quaternary system SiO2-Li2O-TiO2-Al2O3 of the mol% compositions (70,25,2,3), (70,21,6,3), and (70,17,10,3). Glasses of the first composition did not yield appreciable x-ray intensities. Oscillations were observed in the scattered intensities of glasses of the second composition, the amplitudes increasing with the duration of heating. By using a theoretical expression which we recently developed we have easily determined the particle sizes and the degree of monodispersity.
Oscillations in the Porod plot and particle sizes in demixed glasses
BENEDETTI, Alvise;
1988-01-01
Abstract
A new theoretical approach, based on the oscillations sometimes observed in the Porod plot, has been used to estimate particle sizes in phase separated glasses. We have studied the demixing kinetics consequent upon appropriate isothermal heating of the glasses of the quaternary system SiO2-Li2O-TiO2-Al2O3 of the mol% compositions (70,25,2,3), (70,21,6,3), and (70,17,10,3). Glasses of the first composition did not yield appreciable x-ray intensities. Oscillations were observed in the scattered intensities of glasses of the second composition, the amplitudes increasing with the duration of heating. By using a theoretical expression which we recently developed we have easily determined the particle sizes and the degree of monodispersity.
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