Dielectric Studies of RbOH-Doped Ice and Its Phase Transition

Abstract

The dielectric properties and the phase transition of ice Ih were investigated on RbOH-doped polycrystalline ice. Observed dielectric dispersions were roughly decomposed into two Debye type dispersion branches. The low frequency branch was responsible to the temperature dependence of the dielectric properties and the phase transition. The relaxation time of RbOH-doped ice was about 15 times longer than that of KOH-doped ice, but the activation energy did not alter. The temperature of the phase transition was almost the same as that of KOH-doped ice. Species of the alkali ion was effective to the dielectric relaxation but not to the phase transition temperature. This shows that observed phase transition is the intrinsic one of the ice crystal. The role of OH⁻ and alkali ion on the dielectric relaxation and some natures of this phase transition are discussed.