Abstract
Ultrasonic velocities in sodium borate glasses are measured as a function of composition at a frequency of 10 MHz and at a temperature of 298 K by making use of the ultrasonic pulse echo overlap method. Elastic properties of these glasses are analysed in terms of the elastic internal energy due to deformation; elastic resistances of the network-former, B2O3, and the modifier, Na2O, are obtained as a function of composition from the plot ofMV 2 againstx 2, whereM is the molar mass of sodium borate glasses,V the velocity of sound andx 2 the mole fraction of Na2O. The elastic resistances of B2O3 and Na2O are as follows: (i) forx 2<0.33, the elastic resistance of B2O3 is smaller than that of Na2O; (ii) atx 2=0.33, the elastic resistances of B2O3 and Na2O are equal; (iii) forx 2>0.33, the elastic resistance of B2O3 is greater than that of Na2O; (iv) atx 2≈0.15, the elastic resistances of B2O3 and Na2O become respectively maximal and minimal; (v) atx 2≈0.23, the elastic resistances of B2O3 and Na2O become respectively minimal and maximal; (vi) abovex 2=0.36, the elastic resistance of Na2O becomes negative.
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Kodama, M. Ultrasonic velocity in sodium borate glasses. J Mater Sci 26, 4048–4053 (1991). https://doi.org/10.1007/BF02402945
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DOI: https://doi.org/10.1007/BF02402945