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Formation Process and Solid-Liquid Phase Equilibrium of Cs(Cl, Br) Solid Solutions in Aqueous Solution
Ya-Li Wang1,2, Rui-Zhi Cui1, Hong-Bao Ren1
1Key Laboratory of Green and High-end Utilization of Salt Lake Resources, Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.
The Journal of Physical Chemistry. B
|May 19, 2026
Summary
This study explores cesium chloride-cesium bromide-water phase behavior at 298.15 K. It reveals solid solution formation and equilibrium, aiding cesium precipitation prediction in mixed halide systems.
Area of Science:
- Geochemistry
- Materials Science
- Physical Chemistry
Background:
- Understanding cesium behavior is crucial for managing nuclear waste and industrial processes.
- Cesium's complex interactions in mixed halide solutions require detailed investigation.
Purpose of the Study:
- To investigate the formation of cesium chloride-cesium bromide solid solutions.
- To determine the solid-liquid phase equilibrium in the CsCl-CsBr-H2O system at 298.15 K.
- To provide a theoretical basis for predicting cesium precipitation.
Main Methods:
- Multiscale study combining long-term experiments and molecular dynamics simulations.
- Isothermal dissolution equilibrium method to determine phase relationships.
- Pitzer model parametrization using experimental thermodynamic data.
Main Results:
- Characterization of Cs(Cl, Br) solid solution formation.
- Systematic determination of phase equilibrium and construction of a phase diagram.
- Validation of the Pitzer model for solubility calculations.
Conclusions:
- The study elucidates the formation and equilibrium of cesium solid solutions in mixed halide systems.
- Experimental and modeled solubility data provide a basis for predicting cesium behavior.
- This research offers insights into cesium precipitation dynamics relevant to environmental and industrial applications.
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