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+//Example 3.16//
+// Following the calculations of sample problem 3.3 we find that the length of the body diagonal is
+rMg=0.078;//nm // Ionic radius of Magnesium (From Appendix 2)
+rO=0.132;//nm // Ionic radius of Oxygen (From Appendix 2)
+a=2*rMg+2*rO
+//mprintf("a = %f nm",a)
+l=sqrt(3)*a
+mprintf("l = %f nm",l)
+c=1;// Mg^2+
+i=c/l//nm
+mprintf("\n i = %f Mg^2+/nm",i)
+//similarly
+i2=c/l
+mprintf("\n i2 = %f O2-/nm",i2)
+mprintf("\n(1.37Mg2+ + 1.37O2-)/nm")