Correspondence between electronic polarisability and electron donor power of oxygen for silicate slags containing iron oxides from the perspective ofabsorption spectra

The applicability of the electronic polarisability of oxygen (α O ) as a measure of the basicity of silicate slags containing iron oxides has been investigated from the perspective of the charge transfer absorption, i. e. the transfer of electrons from O 2 - to Fe 3 + orbitals, and the redox ratio of (Fe 2 + /Fe 3 + ). Samples used were (i) xNa20-(95-x)SiO 2 -5Fe 2 O 3 (20x-ray fluorescence spectroscopy and wet chemical analysis. Densities and refractive indices as well as absorption coefficients were determined at room temperature in order to derive values of α O from the Lorentz-Lorenz equation. Values of α O for samples (i) indicate that α O expresses the electron donor power of oxygen and can be a measure of the basicity of the whole system even in slags containing iron oxides. With respect to samples (ii), it is likely that α O can be a more reasonable measure of the electron donor power of oxygen or the basicity than the edge of the charge transfer absorption.