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Thermodynamic analysis of solute‐solvent interactions in the solubility‐temperature relations of alkaline‐earth metal tungstates and sodium tungstate
Author(s) -
Roy B. N.
Publication year - 1983
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170180223
Subject(s) - tungstate , strontium , solubility , barium , sodium tungstate , alkaline earth metal , chemistry , mole fraction , mixing (physics) , inorganic chemistry , sodium , solvent , alkali metal , thermodynamics , atmospheric temperature range , tungsten , organic chemistry , physics , quantum mechanics
This paper presents a study of thermodynamic analysis of the solubility‐temperature phase diagrams for solutions of calcium, strontium and barium tungstate in sodium tungstate melts in the temperature range 660 to 1200 °C. At temperatures 1000 °C and above, the solutions were ideal but below 1000 °C the solutions became non‐ideal and the non‐ideality increased with decreasing temperature. At any mole fraction concentration of the solute the excess free energies of mixing and the activity coefficients increased in the order CaWO 4 > SrWO 4 > BaWO 4 , whereas the excess chemical potentials decreased in the order CaWO 4 < SrWO 4 < BaWO 4 .