Interpretation:
Whether ceramic and polymeric materials contain dislocations or not should be determined.
Concept Introduction:
Line imperfections in the perfect crystal lead to the dislocation in the crystals.
Dislocations are types of defects in the crystal. The two basic types of dislocations are edge and screw dislocations. There is also a third type called mixed dislocations.
Edge dislocation is easy to see in a lattice as an extra half-plane of atoms. Since, the defective points are produced due to dislocation in the line this is called a line defect. As compared to the edge dislocation, the screw dislocation is hard to visualize. It also results from shear stress, but the movement of defect line is perpendicular to the stress direction.
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