What is the other name of interstitial defect? In ionic solids generally, the smaller ion (cation) moves out of its place and occupies an intermolecular space. In this case, a vacancy defect is created on its original position and the interstitial defect is experienced at its new position. It is also known as dislocation defect.
What is interstitial defect example?
An ion is missing from its normal position and occupies an interstitial site. Due to this, vacancy defect and interstitial defect are produced. For example, in the crystal lattice of ZnS, a zinc cation is missing from its normal position and occupies an interstitial site.
What is the other name of Frenkel defect?
The Frenkel defect (also known as the Frenkel pair/disorder) is a defect in the lattice crystal where an atom or ion occupies a normally vacant site other than its own.
What is difference between Frenkel defect and Schottky defect?
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. Usually the smaller ion cation leaves its original lattice structure.
Is Frenkel defect a non stoichiometric defect?
Frenkel defect: when the cation misplaced its position from its lattice point to an interstitial position of the crystal lattice, then it is called Frenkel defect. The non-stoichiometric defect can also be divided into two parts, metal excess defect, and metal deficiency defect.
Related question for What Is The Other Name Of Interstitial Defect?
Are interstitial compounds?
An interstitial compound, or interstitial alloy, is a compound that is formed when an atom with a small enough radius sits in an interstitial “hole” in a metal lattice. Examples of small atoms are hydrogen, boron, carbon and nitrogen.
Which one of the following is an example of Frenkel defect?
The examples of this defect are: ZnS, AgCl, AgBr and AgI. So, from the above information we can conclude that silver bromide shows Frenkel defect.
What is the meaning of interstitial site?
interstitial site: a position between the regular positions in an array of atoms or ions that can be occupied by other atoms or ions.
What do you mean by F Centre?
: a point in a crystalline compound (as a silver halide) at which a negative ion missing from the crystal lattice has been replaced by an electron.
Which one is not related to Frenkel defect?
KBr exhibits Schottky defect and not Frenkel defect.
What is anti Frenkel defect?
usually occupied by an atom. During our classes by the "Frenkel defect" we will mean a. defect in which interstitial cation is formed, while "Anti-Frenkel defect" will mean a defect in. which interstitial anion is formed. • Antisite defects - the defect forms when atoms/ions of different type exchange places.
What do you mean by interstitial defect?
An interstitial defect is a type of point crystallographic defect where an atom of the same or of a different type, occupies a normally unoccupied site in the crystal structure. Alternatively, small atoms in some crystals may occupy interstitial sites, such as hydrogen in palladium.
Does AgI show Frenkel defect?
Compounds such as NaCl, ZnS, AgI etc. show Frenkel defect. It is also known as valency defect.
What is Scott Key defect?
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.
Is interstitial defect stoichiometric?
Stoichiometric defects are intrinsic defects in which the ratio of cations to anions remains exactly the same as represented by the molecular formula. Interstitial defect is a defect in which an atom or molecule occupies the intermolecular spaces or interstitial sites in crystals. In this defect.
In which defect cations are present in the interstitial sites?
Frenkel defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its interstitial site.
Are interstitial compounds covalent or ionic?
Interstitial compounds are those which are formed when small atoms like H, C, N, B etc. are trapped inside the crystal lattice of metals. They are generally non-stoichiometric and neither typically ionic or covalent in nature.
Is steel an interstitial alloy?
Steel is an example of an interstitial alloy, because the very small carbon atoms fit into interstices of the iron matrix.
Are interstitial compounds reactive?
Answer: (a) They are chemically reactive. Explanation: These compounds retain metallic conductivity resembling their parent metal in the chemical properties also known as reactivity, still these elements differ in physical properties such as the melting point, hardness etc.
Does interstitial defect increase density?
When some extra constituent particles are present in the interstitial sites, the crystal is said to have interstitial defect. This defect results in the increase in the density of the substance because mass increases but volume remains the same.
What is interstitial defect class 12?
When some extra constituent particles are present in the interstitial site the crystal is said to be have interstitial defect. This defect increases density of the crystal. These above types of defects are shown only by non – ionic solids.
What is interstitial impurity defect?
An interstitial impurityA point defect that results when an impurity atom occupies an octahedral hole or a tetrahedral hole in the lattice between atoms. is usually a smaller atom (typically about 45% smaller than the host) that can fit into the octahedral or tetrahedral holes in the metal lattice (Figure 8.4.
What is the opposite of F center?
An H-center (a halogen interstitial) is in a sense the opposite to an F-center, so that when the two come into contact in a crystal they combine and cancel out both defects. This process can be photoinduced, e.g., using a laser.
What kind of defects are having F-centres?
When non – stoichiometric compounds have excess metal ions, the crystal lattice has vacant anion site. The anion sites that are occupied by electrons are called F – centres. Such defects also impart colour to the crystal. This is a type of defect and is called a metal excess defect.
How is split interstitial formed?
Split-interstitial defect formation
A crystal defect in which a displaced atom forms a bond with a normal atom in such a away that neither atom is on the normal site but the two are symmetrically displaced from it¹.