Viscosity of melts of the system LiF-KF-K2NbF7

Citation
Dk. Nguyen et V. Danek, Viscosity of melts of the system LiF-KF-K2NbF7, CHEM PAP-CH, 54(5), 2000, pp. 277-281
Citations number
6
Categorie Soggetti
Chemistry
Journal title
CHEMICAL PAPERS-CHEMICKE ZVESTI
ISSN journal
03666352 → ACNP
Volume
54
Issue
5
Year of publication
2000
Pages
277 - 281
Database
ISI
SICI code
0366-6352(2000)54:5<277:VOMOTS>2.0.ZU;2-Z
Abstract
The viscosity of melts of the system LiF-KF-K2NbF7 has been measured by mea ns of the computerized torsion pendulum method. The viscosity increases fro m KF through LiF to K2NbF7. Additivity of logarithms of viscosity was adopt ed as the ideal behaviour of the mixture. Deviations from such additive beh aviour in the KF-K2NbF7 binary system as well as in the LiF-KF-K2NbF7 terna ry one are most probably due to the chemical interaction K2NbF7(1) + KF(1) double left right arrow K3NbF8(1). The chemical equilibrium of this reactio n is characterized by the dissociation degree of K3NbF8. At 1100 K it attai ns the value alpha (0) = 0.45. In the ternary system, statistically signifi cant ternary interaction does not take place.