Abstract
Synopsis Dislocations in silver activated rocksalt crystals were decorated by heating them in a hydrogen atmosphere. The so formed silver precipitates have been studied by ultra and electron microscopy. Flat monocrystalline silver flakes extended along (111) planes which lie parallel to the (111) planes of the rocksalt have been found as well as shapeless agglomerates and irregularly filled tubes. These results confirm views expressed by Mitchell, and by Coulomb and Friedel concerning the segregation of vacancies at dislocation lines. Some of the shapeless precipitates exhibit a curious phenomenon when heated just under the melting point by the electron beam: material is suddenly extruded as a loosely wound helicoidal wire.
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