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Electrical and electronic conductivity of CaO-SiO2-FeOx slags at various oxygen potentials: Part II. Mechanism and a model of electronic conduction

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Abstract

The experimental results obtained for ionic and electronic conductivity of ‘FeO’-CaO-SiO2 melts have been analyzed considering the mechanism of each conduction process. The Nernst-Einstein equation was employed to calculate diffusion coefficients of Fe2+ and Ca2+ cations from ionic conductance. A “diffusion-assisted charge transfer” model was developed to explain the dependence of the electronic conductivity on the oxidation state of iron in the slag. The model considers the electronic conduction as a two-step process: in one step, ferrous ions diffuse from their initial position to a proper distance from ferric ions; in the next step, an electron is transferred between Fe2+ and Fe3+. The optimum distance of the iron ions for electron hopping was found to be approximately 4 Å, in great consistency with the values reported for electron transfer between Fe2+ and Fe3+ in aqueous solutions and solid glasses.

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Authors and Affiliations

  1. McMaster University, Canada

    Mansoor Barati Ph.D. student

  2. WP HG Engineering, Toronto, Ontario, Canada

    Mansoor Barati Ph.D. student

  3. Department of Materials Science and Engineering, McMaster University, L8S 4L7, Hamilton, Ontario, Canada

    Kenneth S. Coley (Associate Professor)

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  1. Mansoor Barati Ph.D. student
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  2. Kenneth S. Coley
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Barati, M., Coley, K.S. Electrical and electronic conductivity of CaO-SiO2-FeOx slags at various oxygen potentials: Part II. Mechanism and a model of electronic conduction. Metall Mater Trans B 37, 51–60 (2006). https://doi.org/10.1007/s11663-006-0085-9

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  • DOI: https://doi.org/10.1007/s11663-006-0085-9

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