Phase Equilibria and Thermodynamic Properties of Phases in the H2O–Gd(NO3)3 System

A. V. Dzuban; Дзубан А. В.; A. A. Novikov; Новиков А. А.; A. V. Nesterov; Нестеров А. В.; Sh. Qianchen; Цяньчэнь Ш.; N. A. Kovalenko; Коваленко Н. А.; I. A. Uspenskaya; Успенская И. А.

doi:10.31857/S0044457X22601419

Phase Equilibria and Thermodynamic Properties of Phases in the H2O–Gd(NO3)3 System

Authors: Dzuban A.V.¹, Novikov A.A.¹^,2, Nesterov A.V.¹^,2, Qianchen S.², Kovalenko N.A.¹, Uspenskaya I.A.¹
Affiliations:
1. Faculty of Chemistry, Moscow State University
2. Faculty of Materials Science, Shenzhen MSU-BIT University
Issue: Vol 68, No 2 (2023)
Pages: 248-255
Section: ФИЗИКОХИМИЯ РАСТВОРОВ
URL: https://rjraap.com/0044-457X/article/view/665310
DOI: https://doi.org/10.31857/S0044457X22601419
EDN: https://elibrary.ru/LPCEXU
ID: 665310

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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.

Keywords

solubility, electrolyte solutions, gadolinium nitrate, thermodynamic modeling, Pitzer–Simonson–Clegg model

References

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