Microwave dielectric properties of potassium hydroxide aqueous solutions

Abstract

Microwave dielectric properties of potassium hydroxide aqueous solutions were studied at frequencies of 13 to 25 GHz over a wide range of concentrations and temperatures of 288 to 308 K. Experimental electrical conductivity data were used to determine ionic losses at high frequencies. The static dielectric permittivity σs, dielectric relaxation time τ, and thermodynamic activation parameters of dielectric relaxation (ΔH ɛ ++ , ΔG ɛ ++ , and ΔS ɛ ++ ) were calculated. These quantities decrease in transfer from water to solutions. Thereby we demonstrate that potassium hydroxide has a disturbing effect on the initial hydrogen-bond network of water.