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The Internal Friction of Rock Salt Single Crystals

D. R. Frankl*

  • Columbia University, New York, New York

  • *Present address: Sylvania Electric Products, Inc., Physics Laboratories, Bayside, New York.

Phys. Rev. 92, 573 – Published 1 November, 1953

DOI: https://doi.org/10.1103/PhysRev.92.573

Abstract

The internal friction of rock salt crystals is markedly decreased by mild x-irradiation. This is interpreted as the pinning of dislocations by cation vacancies liberated from vacancy pairs on the trapping of photo-electrons. Very small applied stresses are capable of breaking the pinning points. Under some conditions, such breakage under the vibrational stress of measurement may lead to a doubly valued dependence of internal friction on strain amplitude. A variety of other phenomena occur, most of them being qualitatively explainable on the basis of damping by moving dislocations.

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