Pressure and Temperature Dependence of the Elastic Moduli of Na2O-TiO2-SiO2 Glasses |
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| Authors: | MURLI H MANGHNANI |
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| Affiliation: | Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822 |
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| Abstract: | Ultrasonic interferometry was used to measure elastic-wave velocities and moduli in six Na2O-TiO2-SiO2 glasses; three glasses contained 20 mol% TiO2 and three 25 mol% TiO2. The elastic moduli and their pressure derivatives varied systematically with the SiO2/Na2O molar ratio of the glasses. In the group of glasses which contained 20 mol% TiO2, dK/dP ( K =bulk modulus) decreased linearly from 4.85 to 2.59 as the SiO2/Na2O ratio increased; in the other group, dK/dP decreased from 4.00 to 3.05. Similarly, dμ/dP (μ=shear modulus) decreased with the SiO2/Na2O ratio, but somewhat non-linearly. The extrinsic and intrinsic contributions to the temperature dependencies of the elastic moduli are evaluated in light of the measured pressure dependencies of these moduli. |
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