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

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


VISCOSITY OF MELTS IN THE SYSTEM CaO-FeO-Fe₂O₃-SiO₂
 
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.


PDF (0.5 MB)
 
Licence Creative Commons © 2015 - 2022
Institute of Rock Structure and Mechanics of the CAS & University of Chemistry and Technology, Prague
Webmaster | Journal Contact