WebAnswer: Schottky defect decrease the density of the solid. 77. Give an example of an ionic compound which shows Frenkel defect. Answer: AgCl shows Frenkel defect. 78. What is the number of atoms in a unit cell of a simple cubic crystal? Answer: The number of atoms in a unit cell of a simple cubic crystal is one [8*1/8=1]. 79. WebThe number of atoms present in the crystal before and after Frenkel defect remains same. Due to vacancy formation, Schottky defect reduces density of the solid. Density of the solid crystal before and after Frenkel defect remains same as no atom leaves the solid. Common materials where Schottky defect can be found are: Sodium Chloride (NaCl)
In which of the following defect density increases?
WebMar 8, 2024 · In which of the following defect density increases?A.Schottky defectB.Frenkel defect C.F-centreD.Impurity defect. Ans: Hint: When, density is a … Web2. Defects modify the properties of a sample from that of a perfect crystal. 3. Defects are unavoidable. Even if you can prepare the sample with the purest materials, vacancy defects will occur because disorder will increase the entropy of the system. 4. Historically, point defects in crystals were first considered in ionic crystals, not in g gordon liddy corvette
Point Defects12th PDF Chemical Compounds Chemical …
In crystallography, 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. In elemental systems, … See more Even though Frenkel defects involve only the migration of the ions within the crystal, the total volume and thus the density is not necessarily changed: in particular for close-packed systems, the lattice expansion due to … See more Frenkel defects are exhibited in ionic solids with a large size difference between the anion and cation (with the cation usually smaller due … See more • Kittel, Charles (2005). Introduction to Solid State Physics (8th ed.). Wiley. pp. 585–588. ISBN 0-471-41526-X. See more • Deep-level transient spectroscopy (DLTS) • Schottky defect • Wigner effect • Crystallographic defect See more WebAug 3, 2015 · When Frenkel defect alone is present, there is no decrease in density, however the closeness of the charge brought about by Frenkel defect tends to increase the dielectric constant of the crystal. Compounds having such defect conduct electricity to a … WebSolution. Schottky defect : The absence of a cation or an anion from the position which it is expected to occupy in the periodic arrangement of ions since the solid with a Schottky defect contains lesser ions as compared to perfect crystal. The density of crystal exhibiting Schottky defect will be less as compared to that of perfect crystal. christ university login application status