The dielectric properties of H2O and D2O ice Ih at MHz frequencies
Abstract
The permittivity and loss of ice Ih have been measured between 0.5-100 MHz in the temperature range 243-273 °K. An analysis of the temperature dependence of the limiting high-frequency permittivity ɛ∞ shows that the known decrease in frequency of lattice vibrations with increasing temperature predicts values of ɛ∞ much higher than those measured. It is suggested that the absorptivity at the infrared frequencies should decrease with increasing temperature. Deuteration of ice decreases its ɛ∞ by ∼3%. This is interpreted to indicate less absorption of infrared frequencies in D2O than in H2O ice. Ice shows a secondary relaxation centered in the MHz frequency range with an amplitude of 0.08 at 268 °K. The ɛ∞ of single crystal ice, measured perpendicular to the c axis, is indistinguishable from that of polycrystalline ice, thus indicating little anisotropy of the high-frequency polarization.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- May 1976
- DOI:
- 10.1063/1.432033
- Bibcode:
- 1976JChPh..64.3998J
- Keywords:
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- 77.40.+i