Spontaneous polarization of water in porous structure of a solid body

Abstract

The dielectric permittivity was measured in the frequency range from 5 to 13 MHz for artificial, laboratory-made solid samples of gypsum with different water contents. The measurements were made on distilled water and three samples with different porosity and structure. The two electrode method was used. Two kinds of electrodes were employed, viz. blocking and non-blocking ones. Simple physical models of saturated porous medium in electric field and the equivalent circuits are presented. The dielectric permittivity of water can be estimated from the data by calculations based on the simple model. Two types of dispersion were observed, associated with domain resonance and apparent Debye resonance.