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- W1972559611 abstract "Understanding the changes in viscosity due to the different oxidation states of iron ions is important for simulating phenomena related to molten slags and also for understanding the structure of iron-oxide-containing silicate melts. However, these viscosity changes are not well understood. Here, we show the viscosity changes of R2O–SiO2–FexO (R = Li, Na, or K) melts due to changes in the oxidation states of the iron ions by systematically varying the oxygen partial pressure using several Ar-based gases at 1773 K. The initial compositions of the samples were 30R2O–60SiO2–10Fe2O3 (mol%), and the ratio of Fe3+ to Fe2+ in the R2O–SiO2–FexO melts increased with increasing oxygen partial pressure in all samples. Meanwhile, the viscosity of all the R2O–SiO2–FexO melts decreased with increasing Fe2+ to total-Fe ratio. The data indicate that the increase in the amount of Fe2+ ions, which behave as network modifiers, would result in depolymerization of the silicate melts. It should also be noted that the viscosity of the melts increased in the order of alkali cationic radius (K > Na > Li) when the ratios of Fe2+ to Fe3+ in the melts were comparable. This was due to the change in the coordination structure of Fe3+ in the melts. Not only the oxidation state of the iron ions but also the coordination structure of Fe3+ may be important for understanding the viscosity." @default.
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- W1972559611 date "2013-01-01" @default.
- W1972559611 modified "2023-10-03" @default.
- W1972559611 title "Effect of Oxidation State of Iron Ions on the Viscosity of Alkali Silicate Melts" @default.
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- W1972559611 doi "https://doi.org/10.2355/isijinternational.53.185" @default.
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