Dielectric permittivity and relaxation of aqueous cesium iodide solutions

• Published in: Russian journal of inorganic chemistry 2011-10, Vol.56 (10), p.1666-1669
• Main Authors: Kobelev, A. V., Lileev, A. S., Lyashchenko, A. K.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Dielectric constant; Dielectric relaxation; Dielectrics; Dispersions; Inorganic Chemistry; Mathematical models; Permittivity; Physical Chemistry of Solutions; Resistivity; Spectra
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023611100135

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 ɛ S and well as dielectric relaxation times (τ) and activation enthalpies (Δ H ɛ ++ ). The ɛ S values decrease in going from water to a solution. In concentrated solutions, the slope of the plot of ɛ S versus temperature become zero. The decrease in τ and gD H 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.