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Schottky defect....

Schottky defect.

A

thereisno effect on the density

B

density of the crystal increases

C

density of the crystal decreases

D

any of the above three can happen.

Text Solution

Verified by Experts

The correct Answer is:
C
As a result of Schottky defect, the density of the crystal decreases.
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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