Abstract
A structural study of the molten FeO-SiO2 system has been carried out by means of a high temperature X-ray diffraction technique. The composition range studied was from 0 to 44 mole pct SiO2. From an analysis of the scattering intensity, the radial distribution function was calculated from which interionic distances and coordination numbers were estimated. The following characteristic features emerge from these results. A constant coordination number of about four is obtained for Si-O pairs in the composition range between 17 and 44 mole pct SiO2. This supports the existence of SiO4 tetrahedra in the basic region. The Si-Si distance, which corresponds to the inter SiO4 distance, gradually decreases as the composition increases from 20 mole pct SiO2 and then shows a nearly constant value at compositions beyond 39 mole pet SiO2. This constant value is comparable with the value of the Si-O-Si distance with an angle of less than 180 deg. This indicates that some of the SiO4 tetrahedra polymerize to form silicate anions. The distance of the Fe-Si and Fe-O varies in a similar manner with the Si-Si correlation.
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Waseda, Y., Toguri, J.M. The Structure of the Molten FeO-SiO2 System. Metall Trans B 9, 595–601 (1978). https://doi.org/10.1007/BF03257207
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DOI: https://doi.org/10.1007/BF03257207