Abstract
At present there are two theories which are used to explain the observed amplitude-independent mechanical damping (internal friction) in alkali halides. In the theory of Granato and Lucke it is assumed that the damping constant, B, results from the dislocation interacting with phonons, while in the theory of Robinson and Birnbaum, the assumption is made that the dislocation drag is caused by charged dislocations, interacting with their compensating charge clouds. Both these theories predict a peak in the damping at a frequency of ∼ 10 MHz but the peak in the R-B theory is far less sharp than that in the G-L theory.
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