Velocity and absorption coefficient of ultrasonic waves in molten and glassy silicates and borates |
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Authors: | Kazuhiro Nagata Katsumi Ohira Hisao Yamada Kazuhiro S Goto |
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Affiliation: | (1) Department of Metallurgy, Tokyo Institute of Technology, Tokyo, Japan;(2) Toppan Insatsu Co., Ltd., Tokyo, Japan;(3) Industrial Research Institute of Kanagawa Prefecture, Yokohama-shi, Japan |
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Abstract: | The velocity and absorption coefficient of longitudinal ultrasonic waves with 5 and 10 MHz in molten and glassy silicates
and borates have been measured by means of the pulse-echo method in 300 to 1600 K. The silicate and borate were Na2O−SiO2, K2O−SiO2, PbO−SiO2, Na2O−B2O3, and PbO−B2O3. The velocity of sound decreased with increasing temperature and decreased rapidly near the transition temperature of glasses.
The product of the one-third power of velocity of sound and the molar volume of the oxide melt was constant and independent
of temperature. The absorption coefficient of ultrasonic waves in the oxide melts increased with an increase in viscosity.
The absorption mechanisms of ultrasonic waves and the mean free path of phonons in the oxide melts were discussed. |
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