The number of schottky defects(n) present in an ionic crystal containing N ions temperature T, is given by n = N e –E/2KT where E is energy required to produce n schottky defects and K is Boltzmann constant. The number of frenkel defects (n ′ ) in an ionic crystal having N ion is
n ′ = 
e –E ′ /2KT where E ′ is the energy required to produce n ′ frenkel defects and N i is the number of interstitial sites
(i) What is the mole fraction of schottky defect in NaCl crystal at 1000 K ? The enthalpy of formation of schottky defect = 2 eV and K = 1.38 × 10 –23 JK –1 :
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(i)
Sol. 
= 
= 11.66
∴ mole fraction of schottky defect
= 
= 
= e –11.66
(ii)
Sol. produces atomic displacement leading to
Imperfections
(iii)
Sol. Frenkel
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems