Ultrasonic wave propagation in solid materials at very high frequencies
The attenuation of ultrasonic waves of frequencies from 600 Mc/s to 1120 Mc/s propagating in synthetic and natural quartz crystals has been investigated by the pulse echo technique at temperatures from 4.2°K to 40°K. The results are not in agreement with previous theoretical predictions. A new quant...
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Imperial College London
1963
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| Online Access: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602247 |
| Summary: | The attenuation of ultrasonic waves of frequencies from 600 Mc/s to 1120 Mc/s propagating in synthetic and natural quartz crystals has been investigated by the pulse echo technique at temperatures from 4.2°K to 40°K. The results are not in agreement with previous theoretical predictions. A new quantum mechanical theory of ultrasonic attenuation in dielectrics is expounded which has good agreement with experimental results over a wide range of experimental conditions. The formalism developed in this theory is then used to derive expressions for the ultrasonic attenuation due to interaction of a sound wave with conduction electrons in a metal. |
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