Secondary dislocations in [011] tilt boundaries in germanium

Abstract

The structures of a series of tilt grain boundaries in germanium bicrystals and the interaction of deformation-induced lattice dislocations with these boundaries have been studied using transmission electron microscopy. High-resolution techniques were used to determine the Burgers vectors of the secondary dislocations. The bicrystals were grown from the melt using the Czochralski method to produce the low-Σ grain boundaries: Σ = 11, 33, 41 and 51. The Burgers vector of the secondary dislocations was usually not the primitive Burgers vector which might have been expected by applying O-lattice analysis. This interpretation is consistent with the Burgers vectors determined for secondary dislocations produced by lattice dislocations dissociating on entering the grain boundaries.