Change of Acoustic Attenuation in Sodium during Melting and Solidification Processes
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概要
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The attenuation of ultrasonic wave in sodium has been measured by the pulsetransmission method in the temperature range from 20 to 160'C through themelting temperature of 97.8'C. The frequency of sound ttsed was 1 MHz. Thetypical value of attenuation in solid phase was 0.279 neper/cm, and that in liquidphase was 0.201 neper/cm. At the melting point, a large absorption of ultrasonicwave was seen and its value amounted to 0.51 neper/cm in the melting processand 1.21 neper/cm in the solidification process. The increase of the attenuationat the melting point may be due to the Rayleigh scattering, which is appreciablein the mixed state of the liquid and the suspending crystallites. By combining thepresent results with our previous data on sound velocity, discussion was madeon the variation of elastic and anelastic properties of sodium during its meltingand solidification processes.
- 社団法人日本物理学会の論文
- 1985-02-15
著者
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Sumino Yoshio
Regional Center For Earthquake Prediction And Observation Faculty Of Science
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Kamioka Hiroaki
Department Of Physics Faculty Of Engineering Gifu University
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Kamioka Hiroaki
Department Of Physics Faculty Of Engineering Gfu University
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