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+// Scilab Code Ex5.4 Number of Schottky imperfections in NaCl crystal Page-160 (2010)
+N = 6.023D23;    // Avogadro's number
+k = 8.614D-5;    // Boltzmann's constant, eV/K
+T = 27+273;    // Absolute room temperature, K
+Ep = 2;    // Energy required to remove a pair of Na+ and Cl- ions, electron-volt
+// Now Concentration of imperfections in a crystal is given by
+// n/N = exp(-Ep/(2*k*T)), solving for n
+n = N*exp(-Ep/(2*k*T));    // No. of Schottky imperfections present in NaCl crystal
+printf("\nNo. of Schottky imperfections present in NaCl crystal is : %4.2e", n);
+V = 26.83;    // Volume of one mole of the crystal, cm cube
+n = n/V;    // Number per mole volume of the crystal, per cm cube
+printf("\nConcentration of Schottky imperfections present in NaCl crystal is : %4.2e per cm cube", n);
+//Result
+// No. of Schottky imperfections present in NaCl crystal is : 9.42e+006
+// Concentration of Schottky imperfections present in NaCl crystal is : 3.51e+005 per cm cube 
+\ No newline at end of file