ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)