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What is Schottky defect in a solid ?...

What is Schottky defect in a solid ?

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Schottky defect : It is a stoichiometric defect in which some of the lattice points in a crystal are occupied such that cation-anion ratio remains the same and electrical neutrality is maintained.
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Schottky defect is-

In the Schottky defect:

Strontium crystallizes in a fcc unit cell with edge length a. it contains 0.2% Frenkel defect and another crystal of Sr contains 0.1% Schottky defect. Density of solid with Frenkel defect= d_(f) and density with Schottky defect= d_(S) , then

Schottky defect in a crystal is observed when

Explain the Schottky defects in stoichiometric crystals.

Statement : Schottky defect is generally shown by the compounds with high co - ordination no. Explanation : Equal no. of cations and anions are missing from the lattice sites in Schottky defect.

The number of Schottky defects (n) present in an ionic compound containing N ions at temperature T is given by n = Ne^(-E//2KT) , where E is the energy required to create n Schottky defects and K is the Boltzmann constant, If the mole fraction of Schottky defect in NaCl crystal at 2900 K is X , then calculate -ln(x) , Given: DeltaH of Schottky defect = 2 eV and K = 1.38 xx 10^(-23) J K^(-1) 1 eV = 1.608 xx 10^(-19) J

Ionic solids with Schottky defects contain in their structure

Among the following solids, Schottky defect is NOT observed in-

(a) Define the terms crystalline and amorphous solids. (b) Explain Schottky defect with an example.

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