, Volume 55, Issue 3, pp 1003-1009

Thermodynamic Characteristics of Zirconium and Hafnium Hydroxides in Aqueous Solution

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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.