Abstract
Solid–liquid equilibria in the system H2O–Gd(NO3)3 were measured from –20 to 70°C using the isothermal saturation method. The Pitzer–Simonson–Clegg thermodynamic model was implemented to obtain the temperature dependence of Gd(NO3)3⋅6H2O solubility constant, to calculate salt solubility and to construct a phase diagram of the system from eutectic point to hydrate melting. Thermochemical properties of gadolinium nitrate aqueous solutions, such as dilution enthalpies and heat capacities, were assessed also. The model has shown to be reliable for phase equilibria calculation from –35 to 90°C and from 0 up to ~15 mol % of salt as well as the thermodynamic properties of Gd(NO3)3 aqueous solutions at room temperature and around it.
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This work was performed as a part of state order no. 121031300039-1, “Chemical Thermodynamics and Theoretical Materials Science.”
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A.V. Dzuban and A.V. Nesterov developed the experimental methodology. Sh. Qianchen and A.V. Nesterov obtained experimental results. A.A. Novikov and A.V. Dzuban made theoretical calculations. A.V. Dzuban prepared the draft of the paper. N.A. Kovalenko and I.A. Uspenskaya developed the concept of the study, provided general supervision, and edited the manuscript. All authors participated in the discussion of results.
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Dzuban, A.V., Novikov, A.A., Nesterov, A.V. et al. Phase Equilibria and Thermodynamic Properties of Phases in the H2O–Gd(NO3)3 System. Russ. J. Inorg. Chem. 67 (Suppl 2), S177–S183 (2022). https://doi.org/10.1134/S0036023622602537
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DOI: https://doi.org/10.1134/S0036023622602537