Ultrasonic Attenuation and Dislocation Damping in Crystals of Ice
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概要
- 論文の詳細を見る
The attenuation of megahertz ultrasound has been measured in single crystals of iceat higher temperatures. Specimen crystals were grown by the Bridgman method frompurified water, and crystals doped with various tons were also used. An overdampedresonance peak of dislocation damping always appeared in decrement-vs-frequency,and the peak frequency was shifted by the temperature change and by the Na-ion dop-ing. It was also found that the attenuation value increased very rapidly with large fluc-tuation when the temperature approached the melting point, and that the temperaturedependence of attenuation was sensitive to the Ton doping. Experimental data wereconsistently analyzed on the basis of the vibrating dislocation model with the follow-ing conclusions: Dislocations are pinned by impurity ions (Na ' ) through an elastic interaction between the two kinds of defects; the damping constant for the dislocationvibration is of the order of 10 ' cgs; the density of grown-in dislocations is around10'cm '; the dislocation density rapidly increases as [1 - (T/ 7'....)] 'near the meltingtemperature.
- 社団法人日本物理学会の論文
- 1986-10-15
著者
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Tamura Junichi
Faculty Of Science Tokyo Institute Of Technology:the Furukawa Electric Co.ltd.
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HIKI Yosio
Faculty of Science, Tokyo Institute of Technology
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Hiki Yosio
Faculty Of Engineering Ibaraki University
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Hiki Yosio
Faculty Of Science Tokyo Institute Of Technology
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KOGURE Yoshiaki
Faculty of Science,Tokyo Institute of Technology
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Kogure Yoshiaki
Faculty Of Science Tokyo Institute Of Technology
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Kogure Yoshiaki
Faculty Of Science And Engineering Teikyo University Of Science & Technology
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