The powders were pressed into pellets, and BaSO4 was used as a reference standard for correc-tion of instrumental background. There reflectance was converted to absorbance by Kubelka–Munk function: F(R) ∝ K/S = (1 − R)^2/2 R,
where K is the absorption coefficient, S is the scattering coefficient, and R is the diffuse reflectance.
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