What are planar defects in crystals?
A planar defect is a discontinuity of the perfect crystal structure across a plane. Interfacial defects exist at an angle between any two faces of a crystal or crystal form. These imperfections are found at free surfaces, domain boundaries, grain boundaries, or interphase boundaries.
What are plane defects?
[′plān di‚fekt] (crystallography) A type of crystal defect that occurs along the boundary plane of two regions of a crystal, or between two grains.
What are different types of crystal defects?
Point defects (vacancies, interstitial defects, substitution defects)
What are the three main types of crystal defects?
There are basic classes of crystal defects:
- point defects, which are places where an atom is missing or irregularly placed in the lattice structure.
- linear defects, which are groups of atoms in irregular positions.
- planar defects, which are interfaces between homogeneous regions of the material.
What is Schottky defect example?
Some common example of salts where Schottky defect is prominent include Sodium Chloride (NaCl), Potassium Chloride (KCl), Potassium Bromide (KBr), Caesium Chloride (CsCl) and Silver Bromide (AgBr).
What are Schottky and Frenkel defects?
In Schottky defect the difference in size between cation and anion is small. Frenkel defect contains ionic crystals where the anion is larger than the cation. Both anion and cation leave the solid crystal. Atoms permanently leave the crystal.
What is line defect in crystal?
In crystal defect. Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.
What is Schottky defect explain with diagram?
A Schottky defect is an excitation of the site occupations in a crystal lattice leading to point defects named after Walter H. In ionic crystals, this defect forms when oppositely charged ions leave their lattice sites and become incorporated for instance at the surface, creating oppositely charged vacancies.
What is Franklin defect?
A Frenkel defect is a type of point defect in crystalline solids, named after its discoverer Yakov Frenkel. The defect forms when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy and becomes an interstitial by lodging in a nearby location.
What is Valency defect?
Schottky. In elemental crystals it refers to simple lattice vacancies, also called valency defects. In ionic crystals, this defect forms when oppositely charged ions leave their lattice sites and become incorporated for instance at the surface, creating oppositely charged vacancies.