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

Structure of the Melts of the System KF—K₂Mo0₄

V. Daněk and M. Chrenková

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

Abstract: The densities of the melts in the system KF-K₂MoO₄ were measured using the Archimedean method. From the volume properties point of view the investigated system exhibits almost ideal behaviour, which indicates that the congruently melting compound K₃FMoO₄ which is formed in the system KF-K₂MoO₄ exhibits a low thermal stability and at melting it undergoes a considerable thermal dissociation. The degree of the thermal dissociation was calculated on the basis of both the thermodynamic analysis of the phase diagram and the volume properties of the investigated system. It was found that the degree of thermal dissociation of K₃FMoO₄ at the melting point attains the value alpha0 = 0.81. The dissociation enthalpy, calculated on the basis of the density-values, is ∆H(dis, K₃FMo0₄) = 18.8 kJ mol-1.

Full paper in Portable Document Format: 476a339.pdf

Chemical Papers 47 (6) 339–341 (1993)