Dielectric Properties of Hydrogen Halides. III. High-Frequency Dispersion in Solid Phases of HI and HBr

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Abstract
Dielectric constant and loss measurements have been made at frequencies from 5 to 225 MHz. These are in the range to characterize the relaxation in the intermediate solid phase of HBr from the 89°K λ transition to 98° K and, together with earlier data, the relaxation in HI from the 70°K transition to 92°K. The complex dielectric constant is described in both cases by a skewed arc function rather than the symmetric circular arc functions found for the low-temperature phases. The corresponding loss of long-time dipole correlations suggests a more liquidlike behavior. It is further suggested that deviations of the relaxation rates from temperature dependence of Arrhenius form may be explainable in terms of cooperative interaction effects in a disordered phase.

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