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Thermal analysis and the Archimedean method were used to determine the phase equilibrium and density of the pseudo-binary system K2ZrF6–K2TaF7. Molar volume and excess molar volume were calculated on the basis of the experimental density data. Concentration dependencies of molar volume and molar excess volume for selected temperatures (1,133, 1,153, and 1,173 K) revealed minima at the composition...