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Abstract
The charge on edge dislocations was determined by two methods for KC1 crystals doped with several concentrations of CaCl2.
In the first method, dislocation charges were measured by the potential difference developed between the side surfaces while a specimen was being compressed between tilted plates. The dislocation charge was found negative in Ca++ doped KC1 and its magnitude increased with Ca++ concentration as well as temperature. In the second method, the dislocation produced at the surface scratch moved by the sole action of an electric field larger than a certain value. The dislocation charges were obtained from such critical field and the CRSS. The results agreed well with those obtained by the first method.
A sweep-up mechanism for the edge dislocations to collect K+ vacancies with thermally activated adsorption and desorption processes is proposed and found consistent with experimental observations.