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+// Scilab Code Ex 1.13 :Page-26 (2006)
+clc; clear;
+R = 1;  // For simplicity we assume radius of atom to be unity, m
+// For bcc Structure,
+a = 4*R/sqrt(3);    // Lattice parameter of bcc crystal, m
+// We have (R+r)^2 = (a/2)^2+(a/4)^2, solving for r
+r = sqrt(5)*a/4-R   // Relation between radius of the void and radius of the atom, m 
+printf("\nThe radius of largest void in the bcc lattice = %4.2fR", r); 
+
+// For fcc Structure,
+a = 4*R/sqrt(2);    // Lattice parameter of fcc crystal, m
+// We have (R+r)^2 = (a/2)^2+(a/4)^2, solving for r
+r_fcc = a/2-R   // Relation between radius of the void and radius of the atom, m 
+printf("\nThe radius of largest void in the fcc lattice is %4.2f times larger than that in the bcc lattice", r_fcc/r); 
+
+// Result 
+// The radius of largest void in the bcc lattice = 0.29R
+// The radius of largest void in the fcc lattice is 1.42 times larger than that in the bcc lattice 
+
+
+
+
+