Abstract
Densities of iron oxide melts in equilibrium with CO2-CO gas mixtures have been measured by the Archimedean method employing the double-bob technique. The explored temperature range is 1450 to 1525°C and composition range is Fe3+/ΣFe=0.093 to 0.358. At constant temperatures densities of the melts decrease with increase of Fe3+ content. At higher Fe3+ contents this decrease of density becomes more gradual. At constant compositions densities decrease linearly with increase of temperature. Expansivities of the melts decrease with increase of Fe3+ content. The results are interpreted with a proposed model on the constitution of the melts. It is pointed out that oxygen ions are much more closely attracted to Fe3+ than to Fe2+ and this is responsible for the trends in the relations of both density and expansivity with composition.
