UDC

537.311

Authors

Volkov Aleksandr Sergeevich
Northern (Arctic) Federal University named after M.V. Lomonosov
Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation;
e-mail: a.s.volkov@narfu.ru
Koposov Gennadiy Dmitrievich
Northern (Arctic) Federal University named after M.V. Lomonosov
Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation;
e-mail: fc.genphys@pomorsu.ru

Abstract

The paper presents the research results of the impact of temperature and concentration of acid impurities of dissociating acids (HNO3, H2SO4, H3PO4) on the electric conductivity σ of water-containing disperse system based on fine-grained quartz powder at frequencies of 0.1, 1 and 10 kHz. The studies were conducted with the use of the LCR meter E7-14; a sample based on quartz with the admixture of acid of testing concentration was placed into the measuring cell – plate condenser. The temperatures range was 120…290 K; the range of concentrations of acid impurities was 10^-6…10^-2 M. Based on the fact of the electric conductivity determination of frozen disperse system by the conductivity of ice and on the Debye formulae of frequency dispersion of electric conductivity, the parameters of frequency dispersion of the Debye model were determined: high-frequency σ_∞ and static σ_S conductivities and the relaxation time τ_σ. On the basis of comparison with the similar characteristics for the disperse system without impurity the contribution of impurities into these parameters is determined and the behavioral model of impurity in ice is suggested. At freezing of impure disperse system the states of “ion^––ion defect H3O⁺” and “ion^––orientation defect D⁺” are formed. Bound states are formed from protons in the result of electrostatic and diffusion processes of proton-donor impurity of dissociating acid. When the temperature increases the bound pairs of ions are decomposed.

Keywords

disperse systems, impure ice, electric conductivity, relaxation time, semiconducting properties of ice

References

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