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Which of the following is not an example of point defect?
Frenkel defect
Schottky defect
Edge dislocation
Screw dislocation
Answers (1)
Point defects are defects that occur at a single or small group of atoms within a crystal lattice. These defects can have a significant impact on the material's properties and behaviour. The two most common types of point defects are Frenkel and Schottky defects.
A) Frenkel defect is a type of point defect that occurs when an atom in a crystal lattice is displaced from its normal lattice site and occupies an interstitial position, leaving behind a vacancy at its original lattice site. This type of defect is commonly observed in ionic crystals, where the cations are much larger than the anions. Frenkel defect can affect the electrical and thermal conductivity of the material, as well as its mechanical properties.
B) Schottky defect is another type of point defect that occurs when an equal number of cations and anions are missing from the crystal lattice, resulting in a decrease in the material's density. This type of defect is commonly observed in ionic crystals with high coordination numbers. Schottky defects can impact the material's electrical conductivity, as well as its mechanical and optical properties.
C) Edge dislocation is not a point defect but a type of line defect that occurs when there is a mismatch between two parts of a crystal lattice. In an edge dislocation, one part of the lattice is shifted relative to the other part, resulting in a boundary or line between the two parts. Edge dislocations can affect the material's mechanical properties, such as its strength and plasticity.
D) Screw dislocation is also not a point defect but a type of line defect that occurs when there is a mismatch between two parts of a crystal lattice, but in this case, the mismatch is due to a spiral-like deformation. Screw dislocations can affect the material's mechanical properties, such as its hardness and ductility.
In summary, all of the given options are examples of crystal defects, but edge and screw dislocations are line defects, while Frenkel and Schottky's defects are point defects. Therefore, the answer to the question is C) Edge dislocation is not an example of a point defect.
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