Point Defects
Q1: What is a Point Defect?
Answer:
Lattice defects of the zero dimension are called point defects. They are generally caused when the crystallization occurs at a very fast rate. They occur when the crystal deviates from the ideal arrangement of the crystal.
Q2: Which is a Line Defect?
Answer:
If an entire row of atoms dissociates in any crystal then the defect in the crystal is called the line defect. They are also called dislocation, the strength of a solid deteriorate by the line defects.,
Q3: Which Point Defect Lowers the Density of a Crystal?
Answer:
The Schottky Defect lowers the density of the crystal in Schottky Defect a cation and anion pairs leave the crystal making the crystal less heavy and reducing the density of the crystal.
Q4: What causes Defects in a Material?
Answer:
The defects in the crystal are caused by various factors that include,
- Non-Stichometric Proportion of the solid.
- Impurities in the Crystal lattice.
- Dislocation of the ions in the lattice.
Q5: Name a solid that has both Frenkel and Schottky defects.
Answer:
Silver Bromide (AgBr) is a special crystal that has both Frenkel and Schottky defects.
Q6: What is Frenkel Defect?
Answer:
Frenkel Defect is a point defect in which cations dislocate from their original site to interstitial sites of the lattice.
Q7: What is Schottky Defect?
Answer:
Schottky Defect is a point defect in a solid in which pair of cations and anions are missing from their lattice site.
Point Defects
Solids are made up of a lot of small crystals. However, the defect in solids occurs during the crystallization process due to the fast or moderate rate of crystal formation. Defects are described as irregularities in the arrangement of constituent particles in general. The defect could be a point or a line defect based on the irregular arrangement. A deviation point defect occurs in an ideal crystal when there are anomalies in the arrangement around any point or atom in the crystal. Similarly, a line defect occurs when there is a variation in the arrangement of the entire row of lattice points in crystals.
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