Schottky defect is a point defect in a crystal that occurs due to the absence of equal number of cations and anions from the lattice site creating vacancies. Examples of crystals showing Schottky defect are NaCl, KCl, KBr, CsCl etc.
Q. What are dislocations in crystals?
A dislocation is a linear crystallographic defect or irregularity within a crystal structure which contains an abrupt change in the arrangement of atoms. The crystalline order is restored on either side of a dislocation but the atoms on one side have moved or slipped.
Table of Contents
- Q. What are dislocations in crystals?
- Q. How dislocations can be introduced into the metallic lattice?
- Q. Which type of stoichiometric defect is shown by KCl?
- Q. Which of the following is most appropriate crystal to show Frenkel defect?
- Q. What type of stoichiometric defect is shown by ZnS?
- Q. What type of stoichiometric defect is shown by the crystal?
- Q. What types of stoichiometric defects are shown by I ZnS II AgBr?
- Q. Which defect is shown by ZnO?
Q. How dislocations can be introduced into the metallic lattice?
The atoms of a piece of metal are typically arranged in a regular, repeating structure known as a lattice. This pattern is known as the crystal structure of the metal. When extra atoms are inserted into the lattice, it creates an edge dislocation.
Q. Which type of stoichiometric defect is shown by KCl?
Schottky defect
Q. Which of the following is most appropriate crystal to show Frenkel defect?
CaCl2.
Q. What type of stoichiometric defect is shown by ZnS?
frenkel defect
Q. What type of stoichiometric defect is shown by the crystal?
Complete step by step answer (i) In the given defective crystal, it is clearly visible that an equal number of cations as well as anion is found to be missing from the interstitial site. Thus, this type of stoichiometric defect is known as Schottky defect which is a vacancy defect.
Q. What types of stoichiometric defects are shown by I ZnS II AgBr?
(i) ZnS shows Frenkel defect. (ii) AgBr shows Frenkel defect as well as Schottky defect.
Q. Which defect is shown by ZnO?
Vacancies, interstitials, and anti-sites of Zn and of O are considered to be the native defects in ZnO. As discussed below, the O vacancy, Zn interstitial and Zn anti-site, which are associated with O deficiency or Zn excess, are donor-type defects.
