Abstract
The temperature dependencies of microwave dielectric permittivity and losses of nitrate and sulfate alkali metal aqueous solutions are studied at 288–313K in wide concentration ranges. The dielectric constant ϵ s and dielectric relaxation time τ are determined. It is shown that the order of the decrease of ϵ s for sulphate and nitrate solutions is identical: Li + > Na + > K + > Cs +. The concentration changes of ϵ s in sulphate and nitrate solutions for the same alkali metals (except lithium) are equal when the ionic strength is used instead of salt concentration. The distinctions in temperature and concentration dependencies of ϵ s are observed between the diluted and the concentrated solutions. The temperature changes of ϵ s are absent in concentrated solutions of salts. The changes of dielectric relaxation time are different for sulfate and nitrate solutions. At initial concentrations the relaxation time decreases negative to positive in concentrated Li 2SO 4 solutions. The order of τ changes in concentrated sulfate solutions is Li + > Na + ≈ H 2O > K + > Cs +. The decrease of relaxation time is observed in the alkali metal nitrate solutions. The difference for various alkali metal cations is practically absent in this case. Thus the influence of different anions on water molecule mobility in hydration spheres of cations is shown.
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