Dielectric properties of single crystals of HClhyphen;doped ice

摘要

Dielectric properties of single crystals of HClhyphen;doped ice were measured in a frequency range 5times;10minus;4to 1times;105Hz and temperature range minus;10 to minus;150thinsp;deg;C. Highhyphen;frequency and dc conductivities, sgr;infin;and sgr;0, and relaxation times of the Debye and lowhyphen;frequency dispersions, tgr;Dand tgr;L, showed changes of temperature dependencies at a temperatureTc. Values of sgr;0at temperatures aboveTcwere constant, implying the complete dissociation of HCl molecules producing H3O+ions in the ice lattice, so that sgr;0is proportional to the HCl concentration (nHCl). At temperatures belowTc, both of sgr;infin;and sgr;0were found to vary with the square root ofnHCl. The behavior of sgr;0is in good agreement with earlier results, but that of sgr;infin;is not. The result suggests thatLdefects can be liberated from HCl molecules through some activation process in the crystal lattice of ice.