Determination of the Partial Contributions to the Electrical Conductivity of TiO2-SiO2-Al2O3-MgO-CaO Slags: Role of the Experimental Processing Conditions
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Author(s)
Martin-Treceno, Samuel
Allanore, Antoine
Bishop, Catherine M.
Watson, Matthew J.
Marshall, Aaron T.
Date Issued
February 2022
Journal
Metallurgical and Materials Transactions B
Publisher
Springer Science and Business Media LLC
Citation
Martin-Treceno, Samuel, Allanore, Antoine, Bishop, Catherine M., Watson, Matthew J. and Marshall, Aaron T. 2022. "Determination of the Partial Contributions to the Electrical Conductivity of TiO2-SiO2-Al2O3-MgO-CaO Slags: Role of the Experimental Processing Conditions."
Version
Final published version
Abstract
Abstract
The electrical transport properties of molten TiO2–SiO2–Al2O3–MgO–CaO slags were determined as a function of temperature and oxygen partial pressure. To avoid the corrosion of crucible materials by this slag at ultra high temperatures, the pendant droplet technique was used inside a modified floating zone furnace. Electronic and ionic transference numbers were estimated using stepped-potential chronoamperometry experiments to quantify the contribution of the electronic/ionic conductivity to the total electric conductivity. The results show that these slags are mixed conductors, where current is carried by ionic and electronic carriers. The oxygen partial pressure dependence of the electronic transference numbers,
$$t_e$$
t
e
, indicated a semiconducting mechanism in the molten slag. The ratio of the different valences of the transition metal ions had a predominant effect on the
$$t_e$$
t
e
. The
$${{\text{TiO}}_{2}}$$
TiO
2
content also favoured electronic conduction, while the effect of temperature and structure was less noticeable within the temperature and composition range studied.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1007/s11663-022-02433-5
