Effects of Composition, Pressure, and Temperature on the Elastic, Thermal, and Ultrasonic Attenuation Properties of Sodium Silicate Glasses
HAWAII INST OF GEOPHYSICS HONOLULU
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Elastic moduli of sodium silicate glasses have been measured by ultrasonic interferometry to 5 kbar at 298K and in the temperature range 80 to 498K. The values of pressure and temperature derivatives of the moduli become systematically less anomalous i.e., more positive and more negative, respectively with increasing Na2O content. Similarly, the mode Gruneisen parameters derived from the pressure dependence of elastic wave velocities, and the thermal Gruneisen parameters calculated from thermal expansivity data increase with increasing Na2O content. At low temperatures, the attenuation- temperature curves for these glasses show reversals. The attenuation peak at approximately 47K, found in fused silica, shifts to a higher temperature in these glasses as the Na2O is increased. Implications are discussed in terms of a network model.
- Ceramics, Refractories and Glass