The applicability of the electronic polarisability of oxygen (αo) 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 O2- to Fe 3+ orbitals, and the redox ratio of (Fe2+/Fe 3+). Samples used were (i) xNa2O-(95-x) SiO 2-5Fe2O3 (20<x<50 mol%) and (ii) 30Na2O-65SiO2-5Fe2O3, for the latter the ratio of Fe2+/ Fe3+ being varied by melting the samples in a platinum and a graphite crucibles in air. The chemical compositions of the samples were determined by x-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 αo from the Lorentz-Lorenz equation. Values of αo for samples (i) indicate that αo 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 αo can be a more reasonable measure of the electron donor power of oxygen or the basicity than the edge of the charge transfer absorption.
|Number of pages||8|
|Journal||Physics and Chemistry of Glasses|
|Publication status||Published - 2005 Oct|
ASJC Scopus subject areas
- Ceramics and Composites
- Physical and Theoretical Chemistry