BEHAVIOR OF ACOUSTICAL PARAMETERS OF MIXED-ALKALI SILICATE-GLASSES

Ultrasonic velocity and attenuation in sodium silicate glasses contain ing another monovalent alkali oxide (K2O or Li2O) in different composi tions at a frequency of 5 MHz have been measured by the pulse echo ove rlap method. The densities of the specimens were also measured. The el astic constant, acoustic impedance, thermal expansion coefficient and internal friction of the specimens are calculated from the measured da ta. The above parameters were analysed in terms of structural changes of glasses with composition.