Differences Between Schottky and Frenkel Defect
Schottky Defect and Frenkel defects are two types of point defects that exists in ionic solids. The difference between Schottky defect and Frenkel defect is tabulated below:
Schottky Defect | Frenkel Defect |
|---|---|
Schottky defect in ionic crystals arises when equal number of cations and anions are missing from their normal sites, resulting in equal number of cations and anions vacancies. | Frenkel defect in ionic crystal arises when some ions (generally cations) leave their normal lattice sites and occupy the interstitial sites. |
Decrease in density of crystal. | The density of the crystal does not change. |
Mass decreases. | Mass remains same. |
It is observed in ionic solids having high coordination number. | It is observed in ionic solids having low coordination number. |
Size of cation is equal to size of anion. | Size of cation is lesser than size of anion. |
Example: CsCl, KCl, NaCl, CsBr, etc. | Example: ZnS, AgCl, etc. |
Electrical conductivity increases. | Electrical conductivity remains same. |
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Schottky Defect – Definition, Explanation, Properties, Examples
Schottky defect is a type of point defect that occurs in ionic crystals. It involves the creation of vacancies in both the cation and anion position of crystal lattice. It is commonly observed in ionic compounds with similar sizes of cations and anions.
In this article, we will learn in detail about Schottky defect, its examples, properties and formula to calculate Schottky defect. We will also compare Schottky defect with Frenkel defect.