Abstract
Axial dislocations and other imperfections in single-crystal whiskers of aluminum nitride (hexagonal, wurtzite structure) have been studied by transmission electron microscopy. Axial dislocations with c Burgers vectors and faults on the (101̄0) prismatic planes having fault vectors equal to ½ c have been identified. In addition to simple axial dislocations, the variety of axial imperfections included zig-zagged dislocations and wide periodic imperfections attributed to complicated faults, clearly related to the dislocation with a c Burgers vector. One type of AlN whisker with growth direction 〈c+2a〉 always contained an axial dislocation or the related extended defect, and it is thus concluded that the growth of this type of whisker may have involved an axial dislocation.
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