Dielectric permittivity and relaxation of aqueous cesium iodide solutions |
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Authors: | A V Kobelev A S Lileev and A K Lyashchenko |
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Institution: | (1) Russian Academy of Sciences Inst. Crystallography, Leninskii prospect 69, 119333 Moscow, Russia; |
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Abstract: | The high-frequency dielectric permittivity and losses of CsI solutions were studied at 288–323 K in the range of water dielectric
permittivity dispersion (7–25 GHz). The low-frequency electrical conductivity of these solutions was measured, and ionic losses
at high frequencies were calculated. The Debye or Cole-Cole relaxation model was used for describing the spectra. The low-frequency
limits of these relaxation region were calculated, which are the static dielectric constants ɛS and well as dielectric relaxation times (τ) and activation enthalpies (ΔH
ɛ++). The ɛS values decrease in going from water to a solution. In concentrated solutions, the slope of the plot of ɛS versus temperature become zero. The decrease in τ and gDH
ɛ++ is evidence of the structure-breaking effect of ions on water. At elevated temperatures (313 K), the decrease in τ is minimal.
At 323 K, τ slightly increases in going from water to a solution. |
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Keywords: | |
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