Abstract
Sonic velocity in molten salts can be estimated from absolute molar entropy by means of an equation developed from the Debye theory of specific heats. When tested on 29 molten halide compounds, for which the required data are available, the equation reliably predicts sonic velocity and its negative temperature dependence. When applied to molten alumina, the equation predicts the magnitude of the sonic velocity, but does not yield the correct temperature dependence. For more complex molten salt compounds (such as nitrates and sulfates), a substantial reduction in the molar entropy is necessary for the predicted sonic velocity to agree with the experimental. When entropy contributions, associated with interatomic vibrations and free rotation of the complex ion, are subtracted from the total molar entropy, the equation yields excellent results for these complex molten salt compounds. The nature of the subtracted entropy terms implies that ``gaslike'' degrees of freedom, if present in the liquid, have very little effect on sonic volocities in salt melts containing complex ion species.
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