Abstract
Precipitates in several GaAs crystals with different properties were studied with transmission electron microscopy to reveal their identity, their orientation relationship with the matrix and their morphology. Most of them were identified as elemental rhombohedral As with a tetrahedral shape bounded by GaAs {111} planes. Some of the As precipitates showed a simple orientation relationship with the matrix: (0001) As‖(111) GaAs and [112̄0] As‖[1̄10] GaAs. It was found that this orientation relationsh ip yields a high degree of structural coherence between the two phases and is responsible for the observed tetrahedral precipitate shape. Other As particles associated with dislocations showed a less coherent orientation relationship with a few degree variation from the above relationship, likely due to strain around the dislocation core.
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