Physicochemical properties of fluoride melts containing tantalum

Physicochemical properties of fluoride melts containing tantalum 

Konstantinov et al. [320, 321] investigated the surface tension and density of molten systems K2TaF7 - KC1 and K2TaF7 - KF as well as some molten mixtures containing K2TaF7, KC1, KF and Ta205, using the method of maximum pressure in gas bubble. 

The results were presented in the form of isotherms, in which the properties are plotted versus the concentration. Nevertheless analysis of the isotherms was made based on available melting diagrams approach that the melts consist of TaFg3 and TaF7Cl3 complex ions. However, according to this general conception [312 - 314], the isotherm of the surface tension must, in such a case, have either a minimum or at least display prominence of the dependence in the direction of the concentration axis. 

All compositions investigated showed a linear dependence of the density (p) on the absolute temperature (T in K), as follows  

The values of a and b were calculated for the molten systems K2TaF7 - KF and K2TaF7 - KC1, and are collected in Table 51 [322]. 

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