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Helali D.,Laboratoire Of Thermodynamique Appliquee | Boa D.,University dAbobo Adjame | Zamali H.,Laboratoire Of Thermodynamique Appliquee | Rogez J.,CNRS Institute Materials Microelectronics nanosciences of Provence | Jemal M.,Laboratoire Of Thermodynamique Appliquee
Calphad: Computer Coupling of Phase Diagrams and Thermochemistry | Year: 2011

Based on the available experimental information, the AgNO 3LiNO3NaNO3 ternary system and its low order AgNO3LiNO3, AgNO3NaNO3 and LiNO 3NaNO3 binary systems are thermodynamically assessed using the Calphad method. A set of parameters describing the Gibbs energies of the different phases is presented. Ternary parameters are necessary to describe the liquid phase in a neutral species model where each nitrate is treated as a constituent. Calculated phase diagrams and thermodynamical functions for the three limiting binary systems show good agreement with experimental data. In the ternary AgNO3LiNO3NaNO3 system we have calculated two vertical sections which are in reasonable agreement with the reported experimental data. Also, several isothermal sections are calculated. © 2010 Elsevier Ltd. All rights reserved.

Boa D.,Nangui Abrogoua University | Hellali D.,Laboratoire Of Thermodynamique Appliquee | Licbarski D.,Aix - Marseille University | Tizzotti M.,Aix - Marseille University | And 4 more authors.
Journal of Chemical Thermodynamics | Year: 2015

The (AgNO3 + KNO3) phase diagram is reinvestigated using differential thermal analysis and X-ray diffraction. The system is characterized by a non-congruent equimolar compound AgK(NO3)2 with a polymorphic transition at T = 408.7 K. Three invariant reactions are distinguished: an eutectoid, an eutectic and a peritectic at T = (405.8, 407.8 and 415.9) K ± 2 K respectively. The pure nitrates AgNO3 and KNO3 exhibit (solid + solid) phase transitions at T = (428.9 and 404.5 K respectively. There is a solid solution of KNO3 in β-AgNO3. In contrast, AgNO3 shows no significant solubility in solid KNO3. Combining our results with experimental data available in the literature, an optimization of the thermodynamic parameters in the binary system is performed. The calculated phase diagram and the thermodynamic functions agree well with the experimental data. © 2014 Elsevier Ltd. All rights reserved.

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