Abstract
Solid–solid and solid–liquid equilibria in the binary system (NaNO3+TlNO3) were studied experimentally by simultaneous direct and differential thermal analysis and X-ray diffraction (XRD) techniques. This system exhibits one eutectic reaction at (439 ± 1) K. The phase diagram presents also two polymorphic transitions of TlNO3 at 350 K and 418 K, respectively. The solid–solid phase transition of NaNO3 is obtained at 549 K. Combining our results with experimental data available in the literature, an optimization of the thermodynamic parameters in the binary system (NaNO3+TlNO3) is performed. The calculated phase diagram and thermodynamic functions agree well with experimental data.
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