Observations of the basal glide of dislocations were carried out in situ by using synchrotron radiation topography between -0.2 and -18.4C, under uniaxial compression. The maximum shear stress on the basal plane was chosen to be 0.060MPa in order to observe the glide motion of dislocations under low stresses. The radii of curvature of dislocation bends in the steady-state were measured. The concentration of thermal kinks on the dislocation, and the kink velocity, were separately estimated from the radius of curvature and the dislocation velocity. The migration free energy which was estimated from the kink velocity agreed well with the generally accepted free energy of the Debye relaxation time.

Basal Glide of Dislocations in Ice Observed by Synchrotron Radiation Topography. Y.Okada, T.Ohondoh, S.Mae: Philosophical Magazine A, 1999, 79[11], 2853-68