ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 29, (4) 291 - 299 (1985)

Daněk Vladimír, Ličko Tibor, Pánek Zdeněk
Institute of Inorganic Chemistry, Centre of Chemical Research Slovak Academy of Sciences, CS - 842 36 Bratislava

The viscosity of melts in the syatem CaO-FeO-Fe₂O₃-SiO₂ decreases with increasing content of calcium oxide and iron oxides. The viscosity of the melts in question was found to be a linear function of the mean mole mass of the polyanions calculated on the basis of a statistical model, and an exponential function of the reciprocal value of thermodynamic temperature. The coordination of iron atoms in the melt is genetrally low. The Fe3+ cations were not proved to participate in the formation of the polyanionic network. Complex anions of the type FeO₄5- or Fe₂O₅4- can be assumed to be present. Their content decreases with increasing temperature while a larger portion of larger silicate polyanions is formed. In this way, the Fe3+ cation takes over the function of the tetrahedral network modifier. The phenomenon results in an increase of the mole mass of polyanions with increasing temperature.

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