Abstract
The hydrothermal processing conditions of BaWO4 was studied by using a thermodynamic model of electrolytic solutions in order to avoid the empirical trial-and-error mode for optimizing synthesis of this material. The approach used makes it possible to predict the optimum conditions through stability and yield diagrams, which relate the equilibrium concentration of all species present as a function of temperature, solution pH, and input reagent concentrations. The theoretical predictions were verified by experiments at the predicted optimum conditions. The results showed that the thermodynamic model is adequate to predict the hydrothermal synthesis conditions under which BaWO4 is stable and can be obtained as a phase-pure form.
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