Dielectric spectroscopy of water at low frequencies: The existence of an isopermitive point

Details Dielectric spectroscopy of water at low frequencies: The existence of an isopermitive point Dielectric spectroscopy of water at low frequencies: The existence of an isopermitive point

2010-10-20

arxiv.org/abs/1010.4089v1

Physics

Chemical Physics

4 pages, 4 figures, submitted to Chem. Phys. Lett

Scientific paper

We have studied the real part of the dielectric constant of water from 100 Hz to 1 MHz. We have found that there is a frequency where the dielectric constant is independent of temperature, and called this the isopermitive point. Below this point the dielectric constant increases with temperature, above, it decreases. To understand this behavior, we consider water as a system of two species: ions and dipoles. The first give rise to the so called Maxwell-Wagner-Sillars effect, the second obey the Maxwell-Boltzmann statistics. At the isopermitive point the effect of both mechanisms in the dielectric response compensate each other.

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