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The measurement of the thermodynamic properties of NiO−MnO solid solutions by a solid electrolyte cell technique

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Abstract

The activity of NiO in NiO−MnO solid solutions has been measured using the cell Ni, NiO |Zr0.85 Ca0.15 O1.85|Ni, [NiO]s.s. in the temperature range 900° to 1200°C for compositions between 0 and 80 mol pct NiO. The activity-composition relationships for MnO have been determined by integration of the Gibbs-Duhem equation, and the partial and integral thermodynamic quantities for the system have been calculated. The system exhibits a positive deviation from ideal behavior with a maximum heat of mixing of 850±150 cals per mole, and a positive excess entropy of mixing of 0.24±0.1 cal per mole °C was detected at the equimolar composition.

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Authors and Affiliations

  1. Materials Science Branch, Whiteshell Nuclear Research Establishment, Atomic Energy of Canada, Ltd., Pinawa, Manitoba, Canada

    D. J. Cameron & A. E. Unger

Authors
  1. D. J. Cameron
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  2. A. E. Unger
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Cameron, D.J., Unger, A.E. The measurement of the thermodynamic properties of NiO−MnO solid solutions by a solid electrolyte cell technique. Metall Trans 1, 2615–2621 (1970). https://doi.org/10.1007/BF03038393

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  • DOI: https://doi.org/10.1007/BF03038393

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