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When it comes to stoichiometric defects, sodium chloride displays the Schottky defect rather than the Frenkel defect. Both the cation (Na +) and the anion (Cl) in NaCl have dimensions that are practically identical. The Schottky defect is what these cations and anions are exhibiting in the circuit.
What causes the Schottky defect in sodium chloride?
(i)Schottky defect is exhibited by those ionic compounds that have a modest variation in the size of the cation and the anion, whereas Frenkel defect is exhibited by those compounds that have significant differences in the size of the cation and the anion. Due to the fact that there is not much of a size gap between the Na+ and Cl- ions, it demonstrates a Schottky defect.
Does NaCl exhibit the Frenkel defect as well as the Schottky defect?
The Schottky Defect is a phenomenon that occurs in ionic substances in which the sizes of the cation and anion are very close to one another… There are around 1022 in 1 cm3 of space. Hence, one Schottky defect is present for every 1016 ions. Some examples of this are NaCl, KCl, CsCl, and AgBr. Of of them, AgBr demonstrates both Frenkel and Schottky defects simultaneously.
What kinds of flaws does sodium chloride have?
It has been observed that NaCl has Schottky faults. When an equal amount of Cl and Na+ atoms are absent from their positions in the lattice, defects are produced as a result. This results in the formation of holes. It will still be neutral in terms of electricity despite the absence of some ions.
Is there evidence that sodium chloride has the Frenkel defect?
The presence of a Frenkel defect can be identified in systems in which there is a significant size disparity between cations and anions… Hence, the Frenkel defect is demonstrated by AgCl because of the small size of the Ag+ ion, but it is not demonstrated by NaCl because alkali metal ions are unable to enter into interstital locations.
Non-Stoichiometric Defects in the Solid State 13 – Chemistry – Class 12 – Solid State Chemistry
26 questions found in related categories
Provide an example of the Schottky flaw. what is it.
There is not much of a difference in terms of size between the anions and the cations in the compound lattice. Sodium chloride (NaCl), potassium chloride (KCl), potassium bromide (KBr), caesium chloride (CsCl), and silver bromide are some examples of common salts that exhibit a strong Schottky defect.
What’s the difference between a Frenkel defect and a Schottky defect?
The difference in size between the cation and the anion is rather minor in Schottky defects. Frenkel defect is characterized by the presence of ionic crystals in which the anion is significantly bigger than the cation. The solid crystal is abandoned by both the anion and the cation. In most cases, the cation, which is the smaller ion, abandons its initial lattice structure.
Which flaw does not exist in sodium chloride?
Because the size of the Na+ ion is significantly smaller in comparison to that of the Cl- ion, the Frenkel defect cannot be discovered in NaCl. Frenkel’s defect is not observed in alkali metals because the bigger size of the cation prevents it from fitting in the interstitial space.
What causes the coloration of the compounds NaCl, KCl, and LiCl?
When visible light is shone on a crystal of sodium chloride, the crystal takes on a yellow hue because an unpaired electron in the crystal absorbs the light’s energy, causing it to get excited. Crystals of LiCl and KCl, if present, will have a pinkish hue due to a similar fault, while KCl crystals will have a violet hue.
I. ZnS demonstrates what kinds of stoichiometric flaws, followed by II. AgBr, and then III. NaCl.
(i) There is a Frenkel flaw in ZnS. (ii) The structure of AgBr exhibits both a Frenkel defect and a Schottky defect.
Which element exhibits the Frenkel defect as well as the Schottky defect?
Both the schottky and frenkel flaws are present in AgBr.
Which is not Frenkel defect?
KBr displays Schottky defect rather than Frenkel defect in its crystal structure.
What causes sodium chloride to have a Schottky defect but not a Frenkel defect?
Please explain why: When it comes to stoichiometric defects, sodium chloride displays the Schottky defect rather than the Frenkel defect. The cation, Na+, and the anion, Cl, in NaCl are essentially identical in size to one another…. In contrast, the Frenkel defect is most frequently observed in ionic crystals in which the anion is significantly bigger in size compared to the cation.
Why does sodium chloride occasionally have a yellowish color?
Why does common table salt, often known as NaCl, sometimes have a yellowish hue? The reason that NaCI has a yellow color is because of a metal excess defect. This defect causes unpaired electrons to occupy anionic sites, which are also known as F-centres. The yellow color of the crystal is caused by the absorption of energy from the visible range by these electrons, which causes the excitation.
What is Frenkel defect explain it?
The form of point defect found in crystalline materials that was discovered by Yakov Frenkel and given his name, the Frenkel defect, was named after Frenkel. The defect is created when an atom or a smaller ion, which is typically a cation, moves out of its position in the lattice, which results in the formation of a vacancy, and then becomes an interstitial by settling into a neighboring spot.
Why does the color of KCl turn pink and the color of LiCl turn lilac?
As there is an overabundance of potassium ions, the color of the KCl crystals will appear to be lilac or violet.
Why does liquid chlorine have a pink color?
When a crystal of LiCl is heated in an environment containing Li vapours, the Li atoms in the crystal lose an electron, which results in the formation of Li+ ions. The freed electrons go across the crystal and take up residence in the F centers of the anionic sites. The LiCl crystal takes on a pink color as a result of these electrons.
Why is LiCl the color it is?
When a crystal of LiCl is heated in an environment containing Li vapour, the Li atoms in the crystal lose an electron, resulting in the formation of Li+ ions. The LiCl crystal takes on a pink hue as a direct result of these electrons.
What could be the cause of the absence of Frenkel defects?
Because the Frenkel defect is caused by vacancy of ion, which is shifted in interstitial spaces, and pure alkyl halide do not have vacancy, it is not found in pure alkali metal halides. This is because the Frenkel defect is not found in pure alkali metal halides.
What does it mean when flaws in stoichiometry are referred to as intrinsic defects?
Stoichiometric defects get their name from the fact that they do not change the stoichiometry of the crystal in any way. Because they are caused by a departure from the crystal’s regular arrangement of atoms or ions, they are referred to as “intrinsic defects.” This is because no outside substance is involved in their formation.
What does the Frenkel defect mean when it comes to AgCl?
What causes the Frenkel defect to be present in AgCl? Frenkel Defect: Ionic solids exhibit this flaw in the material. The smaller ion, which is typically a cation, is moved from its normal position to an interstitial site when this happens. It leaves behind an interstitial defect in its new place, while leaving behind a vacancy defect at its previous location.
What are the circumstances that lead to the Schottky defect?
The so-called Schottky defect is characterized by the movement of an atom from the inside of the crystal to the exterior, resulting in the formation of an isolated vacancy. The Frenkel defect is characterized by the movement of one atom to a new location within the solid, between the locations of other atoms.
How many distinct kinds of problems may there be?
Defects can be classified as either minor, major, or severe, depending on their severity.
Is there a stoichiometric value for the Schottky defect?
The Frankel flaw and the Schottky defect are both examples of stoichiometric faults…. Schottky defects appear in a lattice when an equal amount of cations and anions are absent from the structure. In ionic compounds with increasing coordination numbers, the density of the crystal drops, which results in both cations and anions having the same value.
What is the answer to the Schottky defect?
The second solution is referred to as the Schottky defect, and it is essentially a vacancy defect that is displayed by ionic solids. For the purpose of preserving electrical neutrality, this defect results in the absence of an equal amount of cations and anions. A material will have a lower density as a result of this. Ionic solids have a significant amount of Schottky faults in their structure.