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Precision determinations of the viscosities of the molten alkali chlorides are reported. The viscosities are described by Arrhenius equations with a standard deviation of ±0.10% or less. The equations for the viscosity In mPa s are t?(LICI) = 0.10888 exp(2295.5/ ), r?(NaCI) = 0.08931 exp(2841/T), t?(KCI) = 0.06168• exp(3012.4/T), ij(RbCI) = 0.06776 exp(2984.7/7), and t?(CsCI) = 0.07138 exp(2842.8/ 7). The accuracy Is estimated to be ±0.3% at the 68% confidence level. We have Identified and eliminated bubble formation on the oscillating body as a significant error source.

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The separation Into two Immiscible liquid phases of AlClj-NaCt binary melts was studied from ca. 190 to 348 °C. Melt densities and compositions at the point of phase separation were calculated from the expansion of liquids contained In dllatometrlc tubes. The mole fraction of AICI3 at phase separation varies from 0.808 at 193.7 °C to 0.777 at 348 °C. Empirical equations are given which express density and mole fraction of AlCIs at separation as functions of temperature, with overall standard deviations of 0.001 g cm-3 and 0.002, respectively. The thermodynamic Implications of the phase separation are discussed. A phase diagram Is given for the entire AICI3-NaCI binary system.

Precision determinations of the viscosities of four molten alkaline-earth chlorides are reported. The following equations express the results In mPa s with 0.06-0.19% standard deviation: MgCI2, = 0.17985 exp(2470.1/T);