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Solvation phenomena and revision of solid–liquid equilibria in aqueous solutions of two precursors of mixed oxides, the hydrates of cobalt and nickel nitrates

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Abstract

The hydrates of cobalt and nickel nitrates are highly relevant as precursors for the preparation of mixed ceramics. In order to verify the numerous bibliographical data, systematic solubility measurements in aqueous medium under atmospheric pressure and a critical evaluation have been undertaken. By taking solvation phenomena into account, it has proved possible to correlate all the phenomena observed, to obtain equations representative of the liquidus curves, and to refine and extrapolate the experimental curves. The whole stable and metastable coordinates of the invariant transformations in both binary systems have been calculated or more accurately determined.

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Abbreviations

8.314472 J K−1 mol−1 :

Gas constant R

T K:

Thermodynamic temperature

a i(φ) :

Activity of a chemical species i in the phase φ

Γ i(φ) :

Activity coefficient of a chemical species i in the phase φ

Y i(φ) :

Molar fraction of a chemical species i in the phase φ

x :

Global salt molar fraction in the binary system

x *i :

Molar fraction of species i for the reference composition

T melt K:

Melting temperature under atmospheric pressure

Δmelt H T J mol−1 :

Melting enthalpy under atmospheric pressure

Δsolv H :

Solvation enthalpy under atmospheric pressure

Δmelt C P J K−1 mol−1 :

Melting heat capacity change under atmospheric pressure

h :

Mean coefficient of solvation of the salt

h + :

Solvation number of a cation

h − :

Solvation number of an anion

K reaction :

Equilibrium constant of a chemical reaction

ξ :

Extent of reaction

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Authors and Affiliations

  1. Laboratoire Multimatériaux et Interfaces, Université de Lyon, Univ Lyon 1 UMR CNRS 5615, 69622, Villeurbanne, France

    Richard Tenu, Christelle Goutaudier & Jean-Jacques Counioux

  2. Laboratoire Physico-Chimie des Procédés et Matériaux, Faculté des Sciences et Technologies, Université Hassan Premier, Settat, Morocco

    Bahija El Goundali & Mohammed Kaddami

Authors
  1. Richard Tenu
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  2. Christelle Goutaudier
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  3. Bahija El Goundali
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  4. Mohammed Kaddami
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  5. Jean-Jacques Counioux
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Correspondence to Jean-Jacques Counioux.

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Tenu, R., Goutaudier, C., El Goundali, B. et al. Solvation phenomena and revision of solid–liquid equilibria in aqueous solutions of two precursors of mixed oxides, the hydrates of cobalt and nickel nitrates. J Therm Anal Calorim 112, 263–270 (2013). https://doi.org/10.1007/s10973-012-2852-y

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