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Thermodynamics of the oxidation of rare earth oxysulfides at high temperatures

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Abstract

The thermodynamics of the oxidation of rare earth oxysulfides to their respective oxysulfates was investigated at 1000 to 1500 K using oxygen concentration cells of the type: Pt (s)∣RE2O2S (s), RE2O2SO4 (s), RE2O3 (s)∣CSZ∣Air(p02 = 0.21 atm)∣Pt (s) where CSZ represents the calcia stabilized zirconia solid electrolyte and RE − La, Pr, Nd, Sm, Eu, Gd, Tb, and Dy. It was found that the stability of oxysulfates with respect to their respective oxysulfides decreases as the atomic number of the rare earth increases. The standard free energies of oxidation of oxysulfides to oxysulfates for the above rare earths were used to estimate the standard free energies of oxidation of the oxysulfides of higher atomic number rare earths.

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Authors and Affiliations

  1. Ontario Research Foundation, Sheridan Park Research Community, L5K 1B3, Mississauga, Ontario, Canada

    R. K. Dwivedi (Associate Research Scientist)

  2. Department of Metallurgy and Materials Science, McMaster University, L8S 4L7, Hamilton, Ontario, Canada

    D. A. R. Kay (Professor)

Authors
  1. R. K. Dwivedi
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  2. D. A. R. Kay
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Dwivedi, R.K., Kay, D.A.R. Thermodynamics of the oxidation of rare earth oxysulfides at high temperatures. Metall Trans B 15, 523–528 (1984). https://doi.org/10.1007/BF02657383

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  • DOI: https://doi.org/10.1007/BF02657383

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