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The low-temperature dynamic crossover in the dielectric relaxation of ice Ih

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Abstract

Based on the idea of defect migration as the principal mechanism in the dielectric relaxation of ice Ih, the concept of low-temperature dynamic crossover was proposed. It is known that at high temperatures, the diffusion of Bjerrum and ionic defects is high and their movement may be considered to be independent. Simple switching between these two mechanisms leads to a dynamic crossover at ∼235 K. By introducing coupling between the Bjerrum and ionic defects, it is possible to describe the smooth bend in the relaxation time at low temperatures in ice Ih. However, because the mobility of Bjerrum orientation defects slows down at low temperatures, they may create blockages for proton hopping. The trapping of ionic defects by L-D defects for a long period of time leads to an increase in the relaxation time and causes a low-temperature crossover. This model was validated by experimental dielectric measurements using various temperature protocols.

Graphical abstract: The low-temperature dynamic crossover in the dielectric relaxation of ice Ih

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Publication details

The article was received on 22 Aug 2017, accepted on 09 Oct 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05731H
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    The low-temperature dynamic crossover in the dielectric relaxation of ice Ih

    I. Popov, I. Lunev, A. Khamzin, A. Greenbaum (Gutina), Y. Gusev and Y. Feldman, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP05731H

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