Lattice defects Burgers vector

Molecule Crystal lattice Homogeneous surface Lattice defect Irregular structure Rotation/reflection Spatial translation Surface translation Homotopy Dilation (self-similarity) Molecular point group Space group 2-dimensional unit cell Burgers vector Fractal dimension Spectroscopy X-ray analysis Adsorption studies Crysttd properties Scaling laws... 

Figure 4. Isolated topological defects in a triangular lattice, (a) Isolated -1 and +1 disclinations. A vector aligned along a local lattice direction is rotated by 60° upon parallel transport around a unit strength disclination. (6) An isolated dislocation. The heavy line represents a Burgers circuit around the dislocation, and the Burgers vector of the dislocation is the amount by which the circuit fails to close. The core of the dislocation is a tightly bound pair of +1 and -1 disclinations (Reproduced from [78] by permission of Oxford University Press.)...

The occurrence of defects in the crystal lattice can act as nucleating sites for step growth and in particular dislocations with a screw component of the Burgers vector normal to that of the crystal face (Figure 2.12). The most important type of dislocation is a screw dislocation that causes a discontinuity in the crystal surface called a screw dislocation, which is a hne defect in the crystal surface (Figure 2.12). The height displacement brought about by this slip creates a step... 

In extended defects, the displacement vector b (or R) associated with them can be defined from the Burgers Circuit shown in figure 2.4(a), for a simple cubic system (Frank 1951, Cottrell 1971, Amelinckx et al 1978). In the defective crystal (A), a sequence of lattice vectors forms a clockwise ring around the dislocation precisely the same set of lattice vectors is then used to make a second... 

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