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+//Example number 8.3, Page number 8.17
+
+
+clc;clear;close
+
+// Variable declaration
+a=(2*2.82*10^-10) // in m
+delta_Hs=1.971*1.6*10^-19 // unitless
+k=1.38*10^-23 // Constant
+T=300 // in K
+
+// Calculations
+V=a^3                           // Volume of unit cell of NaCl
+N=4/V                            // Total number of ion pairs
+n=N*exp(-delta_Hs/(2*k*T))  //concentration in per m^3
+
+// Result
+printf("Volume of unit cell of NaCl = %.3e m^3",V)
+printf("\nTotal number of ion pairs ''N'' = %.2e",N)
+printf("\nThe concentration of Schottky defects per m^3 at 300K = %.2e",n)