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+//Example2.8//
+//From Appendix 2
+rAl=0.057;//nm //Ionic radius of Aluminium
+rB=0.02;//nm //Ionic radius of Boron
+rCa=0.106;//nm //Ionic radius of Calcium
+rMg=0.078;//nm// Ionic radius of Magnesium
+rSi=0.039;//nm //Ionic radius of Silicon
+rTi=0.064;//nm //Ionic radius of Titanium
+rO=0.132//nm //Ionic radius of Oxygen
+r=rAl/rO
+mprintf("r = %f ",r)
+//For B2O3
+r1=rB/rO
+mprintf("\nr1 = %f ,giving CN=2",r1)
+//For CaO
+r2=rCa/rO
+mprintf("\nr2 = %f ,giving CN=8",r2)
+//For MgO
+r3=rMg/rO
+mprintf("\nr3 = %f ,giving CN=6",r3)
+//For SiO2
+r4=rSi/rO
+mprintf("\nr4 = %f ,giving CN=4",r4)
+//For TiO2
+r5=rTi/rO
+mprintf("\nr5 = %f ,giving CN=6",r5)
+mprintf("\nThe coordination number for the cation is obtain from Table 2.1")