Relaxation of silica above and below T_g: light scattering studies

Authors: Guenot P.; Champagnon B.; Parc R.L.

Source: Philosophical Magazine B, Volume 82, Number 2, 20 January 2002 , pp. 251-255(5)

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Abstract:

In a pure silica glass, different fictive temperatures are achieved between 1500 and 1100°C. These temperatures are checked by the position of the Si - O - Si Raman band. Light scattering for the different samples due to density fluctuations is determined by the Landau-Placzek ratio which decreases when T_f decreases. Further relaxation occurs in this glass 300°C below T_g; it is interpreted in correlation with the subrelaxational process induced by the diffusion of a few parts per million of impurities.

Language: English

Document Type: Research article

Publication date: 2002-01-20

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