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Density of the System LiF—KF—K2NbF7

M. Chrenková, V. Daněk, and A. Silný

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


Abstract: The density of the melts in the system LiF-KF-K2NbF7 has been measured using the Archimedean method. On the basis of the determined density values the molar volume, partial molar volume, and excess molar volume of the melts were calculated. In the boundary system KF-K2NbF7 the congruently melting compound K3NbF8 is formed. This compound exhibits a low thermal stability and at melting it undergoes a thermal dissociation. The degree of the thermal dissociation was calculated on the basis of both the thermal analysis of the phase diagram and the volume properties of the investigated system. It was found that the degree of the thermal dissociation of K3NbF8 at the melting point attains the value alpha (0) = 0.44.

Full paper in Portable Document Format: 545a272.pdf


Chemical Papers 54 (5) 272–276 (2000)

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