In some paper they also plot (ahv)2 Vs hv for TiO2 but is indirect semiconductor so plot should be (ahv)1/2 Vs hv . I am attaching one file two slopes are needed or one tangent is extrapolated to do y-axis =0
Plotting (F(R) x hv)2 or 1/2 versus hv can give more precise values of bandgaps where F(R) is the K-M transformation of the %R data.
@Abdul Hameed Thank you Sir I am using Kubelka -Munk function only but this is the Querry only
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