Solid Solutions of Ice and NH4F and Their Dielectric Properties

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Abstract
The solidus curve for the system H2O–NH4F was partly determined by means of chemical analyses, heating curves and a dilatometric method, and partly estimated from the liquidus curve using a thermodynamic relation. The solubility limit thus estimated is roughly 10%. The dielectric relaxation times, τ, of solid solutions of ice containing 0.002 to 10 weight percent NH4F were measured at temperatures of about —60° to —10°C. The activation energies for dipole rotation were only about 4 kcal/mole as compared with 13 kcal/mole in pure ice. At low concentrations the frequency factor increases with increasing concentration of NH4F. At high concentrations of NH4F this trend is reversed.

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