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Viscosity of Melts of the System LiF-KF-K2NbF7

D. K. Nguyen and V. Daněk

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava


Abstract: The viscosity of melts of the system LiF-KF-K2NbF7 has been measured by means of the computerized torsion pendulum method. The viscosity increases from KF through LiF to K2NbF7. Additivity of logarithms of viscosity was adopted as the ideal behaviour of the mixture. Deviations from such additive behaviour in the KF-K2NbF7 binary system as well as in the LiF-KF-K2NbF7 ternary one are most probably due to the chemical interaction K2NbF7(1) + KF(1) double left right arrow K3NbF8(1). The chemical equilibrium of this reaction is characterized by the dissociation degree of K3NbF8. At 1100 K it attains the value α0 = 0.45. In the ternary system, statistically significant ternary interaction does not take place.

Full paper in Portable Document Format: 545a277.pdf


Chemical Papers 54 (5) 277–281 (2000)

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