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thermodynamics of nitrogen in BaO-TiOx melts

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Abstract

Using a gas-slag-metal equilibration technique, nitrogen contents in BaO-TiO^ slags and nitrogen and titanium contents in liquid Cu were measured at 1823, 1873, and 1923 K under controlled partial pressures of oxygen(@#@ PO 2 = 10-11.5 ≈ 10-13.7 atm) and nitrogen(@#@ PN 2 = 0.9 atm). The nitride capacity, C(N) [=(mass pct N) · PO2/3/4, (mass pct Ti3+)/(mass pct Ti4+) ratio, and solubility of TiN in BaO-TiO2-TiO1.5 slags were obtained as a function of slag com-position(@#@ XBaO = 0.20 = 0.43) and temperature. Activity coefficients of TiN were estimated, using the values for activity coefficients of Ti in liquid Cu which were calculated from the results of a TiN saturation experiment. Free energy of dissolution of nitrogen into liquid Cu was derived as °GGN o = 32,400 + 46.17 ± 1400 (J/g · atom).

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Authors and Affiliations

  1. Institute for Advanced Materials Processing, Tohoku University, Sendai, Japan

    Katsutomo Tomioka (Graduate Student) & Hideaki Suito (Professor)

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  1. Katsutomo Tomioka
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  2. Hideaki Suito
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Tomioka, K., Suito, H. thermodynamics of nitrogen in BaO-TiOx melts. Metall Trans B 24, 131–138 (1993). https://doi.org/10.1007/BF02657879

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  • DOI: https://doi.org/10.1007/BF02657879

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