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Using the difference of ionic electronegativity expressed/designated as XA and XB. The formula is written as %IC={1-exp[(-0.25)(XA-XB)^2]}*100. the procedure is put in your electronegativities, (the order doesn't matter because we square the difference) and then square the difference. Then multiply that by -0.25 and put it on the exp, which you then subtract from one and times by 100. The exp is the way they write e^x for some reason.
Example: %IC of TiO2
electronegativity:
Ti=1.5
O=3.5
%IC={1-e^[(-0.25)(1.5-3.5)^2]}*100
1.5-3.5=-2
%IC={1-e^[(-0.25)(-2)^2]}*100
-2^2=4
%IC={1-e^[(-0.25)4]}*100
-0.25*4=-1
%IC={1-e^-1}*100
e^-1=0.367879441
%IC={1- 0.367879441 }*100
1- 0.367879441=0.632120559
%IC=0.632120559*100
0.632120559*100=63.2120559
Do your rounding, add a % sign and %IC of TiO2= 63%
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