Abstract
It is shown that when a single crystal of an ionic solid is subjected to pure bending, the sign of the charge carried by edge dislocation lines can be determined. An experiment is described in which a specimen is deformed by four-point loading, and the potentials developed between the crystal faces and an electrode lying on the elastic neutral axis are measured. In sodium chloride under these conditions the surfaces are positively charged, indicating that a positive charge is carried by jogged edge dislocation lines.
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