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Attenuation of Pure Elastic Modes in NaCl Single Crystals

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1 Author(s)
Papadakis, Emmanuel P. ; Laboratory for Insulation Research, Massachusetts Institute of Technology, Cambridge, Massachusetts

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Pulse‐echo ultrasonic attenuation measurements were made for longitudinal and transverse waves in the [100], [110], and [111] propagation directions in NaCl specimens cut from a single boule. The attenuation α was proportional to the orientation factor Ω (relating the resolved stress on the slip system of the crystal to the applied stress), and to the square of the frequency f. Under x‐ray irradiation, α decreased for modes with Ω=≠0 but remained constant where Ω=0. Dislocation damping is considered to cause the loss.

Published in:

Journal of Applied Physics  (Volume:34 ,  Issue: 7 )