Pressure dependence of density and structural relaxation of glass near the glass transition region
1 : Institute of Geosciences, Johannes Gutenberg University
55128 Mainz -
Germany
2 : SCHOTT AG
* : Corresponding author
55122 Mainz -
Germany
A simplified and effective pressure cell together with an experimental procedure has been developed and applied to compress samples of SCHOTT N-BK7â glass under static high pressures in a piston-cylinder apparatus. Results from the density and volume recovery measurements show that, the glass samples were effectively densified in piston-cylinder apparatus with the density at room temperature increasing linearly with frozen-in pressure. To explain the experimental data, we developed a mathematical model based on a suggestion by Gupta (1988) with two internal parameters, named fictive temperature (Tf) and fictive pressure (Pf), which fits the experimental data well.
| Subject : | : | Oral |
| Topics | : | PRESSURE AND GLASSES |
| Keywords | : | Glass ; High pressure ; Piston cylinder apparatus ; Structural relaxation ; Fictive temperature ; Fictive pressure. |
| PDF version | : |  PDF version |
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