Relaxation Phenomena of Ultrasonic Waves on Molten Alkali Silicates
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概要
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The temperature and the frequency dependencies of velocities and absorption coefficients of ultrasonic waves have been measured on molten alkali silicates (33(mol%)M2O–67SiO2 (M = Na and K)) using the pulse transmission technique. The velocities and the absorption coefficients have been determined by the Fourier transform of ultrasonic pulses. It has been found that the velocities, c, increases with decreasing temperature, while the absorption per wavelength, αλ, increases and then decreases with decreasing temperature. It has also been found that the c and αλ values are identical irrespective of frequencies above ca. 1400 K for 33Na2O·67SiO2 and ca. 1500 K for 33K2O·67SiO2, respectively, while dispersion, i.e., frequency dependency, appears below these temperatures. The dispersions of acoustic properties have been successfully interpreted using a structural relaxation model.
著者
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Hayashi Miyuki
Department Of Chemistry And Applied Chemistry Faculty Of Science And Engineering Saga University
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Nagata Kazuhiro
Department Of Cell Biology Chest Disease Research Institute Kyoto University
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Hayashi Miyuki
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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Kitamura Youhei
Department of Chemistry and Materials Science, Tokyo Institute of Technology
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