Journal of Thermal Analysis and Calorimetry

, Volume 55, Issue 3, pp 1003–1009

Thermodynamic Characteristics of Zirconium and Hafnium Hydroxides in Aqueous Solution

  • V. P. Vasil'ev
  • A. I. Lytkin
  • N. V. Chernyavskaya
Article

Abstract

The enthalpies of dissolution of ZrCl4, ZrBr4, HfCl4 and HfBr4 in water in weakly acidic and alkaline solutions were measured at 25°C in a calorimeter provided with an isothermal cover. The standard enthalpies of formation of Zr(OH)4 and Hf(OH)4 in solution were measured. The thermodynamic characteristics of the reactions which resulted in the formation of tetrahydroxy complexes of Zr and Hf in aqueous solution were also determined.

complexes entropies hafnium hydroxides standard enthalpies of formation standard Gibbs energy of formation zirconium 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • V. P. Vasil'ev
    • 1
  • A. I. Lytkin
    • 1
  • N. V. Chernyavskaya
    • 1
  1. 1.Ivanovo State Chemistry and Technology AcademyRussia

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