The atom positions and local structure around the central stacking fault of a Z-shaped faulted dipole in deformed material were evaluated numerically, for the first time, by means of high-resolution electron microscopy. Comparison with simulated images showed that the stacking fault generated large local atomic displacements and had a different structure to that of the intrinsic stacking fault of a dissociated dislocation. A central stacking fault which connected the 2 stair rods of the dipole was found to have a local atomic displacement following a faulting reaction due to the motion of a Shockley dislocation. The central stacking fault exhibited a tendency to unfault, and adopted a atomic structure, making it very distinct from other stacking faults.

Atomic arrangement of a Z-shaped faulted dipole in deformed GaAs S.H.Lim, D.Shindo, I.Yonenaga, P.D.Brown, C.J.Humphreys: Physical Review Letters, 1998, 81[24], 5350-5