Table of Contents
- 1 When an electron occupies the empty space of negatively charged ions the the defect in crystal is?
- 2 Which point defect is observed in a crystal when the anionic vacancy is filled by an electron?
- 3 What type of stoichiometric defect is shown by ZnS?
- 4 Which of the following is stoichiometric defects observed in ionic crystal?
When an electron occupies the empty space of negatively charged ions the the defect in crystal is?
vacancy
In the Frenkel defect, an atom moves to a new position between other atoms of the solid. The empty space created by the migration of the atom is a vacancy. The relative numbers of these two types of defects vary from crystal to crystal. See also colour…
What is Schottky defect in a crystal?
A Schottky defect is an excitation of the site occupations in a crystal lattice leading to point defects named after Walter H. Schottky. 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 Frenkel defect and Schottky defect with example?
Key Differences Between Schottky and Frenkel Defect
| Schottky Defect | Frenkel Defect |
|---|---|
| Atoms permanently leave the crystal. | Atoms remain within the solid crystal. |
| There is formation of two vacancies. | Only one vacancy is created. |
| The density of the solid decreases. | Density remains the same. |
Which point defect is observed in a crystal when the anionic vacancy is filled by an electron?
Schottky defect
Schottky defect is observed in crystals when .
When an electron occupies the empty space of?
General Science F centre is also known as Farbe centre or color centre because the electrons that occupy the empty space of negatively charged ions absorb light due to which the color of the material changes. The vacancy caused by negatively charged ions is known as anionic vacancy.
What is vacancy defect class 12?
1. Vacancy defect:- When is in a crystalline substance, some of the lattice sites are vacant the crystal is said to have vacancy defect it results in decrease of density of substance.
What type of stoichiometric defect is shown by ZnS?
(i) ZnS shows Frenkel defect.
What are stoichiometric defect in ionic crystal?
the stoichiometric defects in the ionic crystal are the defects in which the equal no. of cations and anions from the crystal lattice are removed but the ratio of the cations and anions remains the same as the preceding ratio…..these defects results in the maintenance of electrical neutrality of crystal ….
What is Schottky defect Give 1 example?
Schottky defect is shown by ionic substances in which the cation and anion are of almost similar sizes. For example, NaCl, KCl, CsCl and AgBr. It may be noted that AgBr shows both, Frenkel as well as Schottky defects.
Which of the following is stoichiometric defects observed in ionic crystal?
In which type of point defect are the cations and anions absent in stoichiometric proportions?
Clarification: A vacancy defect is when an atom, ion or molecule is absent from its position in the lattice. When this occurs for ionic solids, it is called a Schottky defect. Cations and anions are found to be absent in stoichiometric proportion so that the electrical neutrality of the crystal is maintained. 5.
Who discovered Frenkel defect?
Yakov Frenkel
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.