The surface of the nanowires is generally smooth and free from structural dislocations as shown in Fig 5b.
No holes or cracks were seen in the fibres and AFM did not indicate that the accessibility of the internal parts of the cell wall matrix had been improved due to structural dislocations.
We evaluate to which extent the geometrical properties of the constitutive 'bricks' (hillocks for ammonia assisted molecular beam epitaxial film) and structural defects (dislocation pits for metal organic vapor phase epitaxial film) affects the statistical properties of heights of these GaN surfaces.
Plasticity, as the name of a science, refers either to mathematical descriptions of what happens in plastic deformation in terms of stresses, strains, and loads or to physical explanations of plastic flow in terms of atoms, crystals, grains, and motions of structural defects (dislocations) within crystals.
For crystalline metals, the structural carriers (dislocations and twins) of plasticity have been well characterized.
It is demonstrated that fatigue failure under normal loading is preceded by complete dissolution of initial cementite particles with carbon localized on structural defects (dislocations, subboundaries, and boundaries), micropores, and microcracks.
On the other hand, the sample prepared at 860 °C under 350 MPa for 48 h exhibits the worst characteristic features of high Tc-phase as a consequence of the enhancement in local structural distortions, dislocations, defects and disorders in the Cu O2 consecutively stacked layers.
Structural defects include dislocation, vacancies, grain boundaries, impurities, and precipitation.
However, this is rather surprising considering a lattice mismatch of 29% between InN and sapphire, known to produce structural defects (misfit dislocations) in films.
Our HRTEM results show that the 30-s Sb spray process that we adopted in our fabrication can greatly reduce the structural defects and dislocations of our InAs/GaAs system and prevent the formation of extended defects.
