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Thermodynamical study of the zinc selenate-cobalt selenate-water system at 25°C

Thermodynamische Untersuchung des Systems Zinkselenat-Kobaltselenat-Wasser bei 25°C

  • Anorganische Und Physikalische Chemie
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Summary

The solubility in the ZnSeO4-CoSeO4-H2O system has been studied at 25°C. It has been established that the CoSeO4·6H2O monoclinic crystal structure is unstable and undergoes a change into a tetragonal structure due to the included zinc ions. Activity coefficients of the salt components in the saturated solutions and in the mixed crystal hexahydrates have been determined by the isopiestic method. ΔG F of (ZnxCo1−x)SeO4·6H2O mixed crystals shows a negative deviation from ideality.

Zusammenfassung

Die Löslichkeitsisotherme des Systems ZnSeO4-CoSeO4-H2O wurde bei 25°C untersucht. Es wird festgestellt, daß das monokline CoSeO4·6H2O unstabil ist und in tetragonale Mischkristalle übergeht. Mittels der isopiestischen Methode wurden die Aktivitätskoeffizienten der Komponenten in den gesättigten Dreistofflösungen und Mischkristallen bestimmt. ΔG F der Mischkristallbildung weist eine negative Abweichung vom idealen Zustand auf.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Institute of Chemistry and Technology, Burgas, Bulgaria

    T. Ojkova

  2. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

    D. Stoilova & D. Staneva

Authors
  1. T. Ojkova
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  2. D. Stoilova
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  3. D. Staneva
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Ojkova, T., Stoilova, D. & Staneva, D. Thermodynamical study of the zinc selenate-cobalt selenate-water system at 25°C. Monatsh Chem 125, 1067–1074 (1994). https://doi.org/10.1007/BF00811514

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  • DOI: https://doi.org/10.1007/BF00811514

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