Impedance spectroscopy techniques were used for analysis of the physical model in a two-phase system toward determining of dielectric constant of dielectric particles suspended in liquids at various solids loading (volume fraction) levels. Model experimental studies were conducted using BaTiO3 as a dielectric material that was prepared as small cubes of uniform size (2×2×1 mm). Barium titanate (BT) cubes having a dielectric constant of 3850 were immersed in liquids of low dielectric constant and moderate electrical conductivity. Measured impedance spectra consisted of two semicircles, which were fitted for (R∥C)(R∥C) equivalent circuit. The parameters obtained from fitting were compared with the data acquired from simulations of brick layer models and Maxwell-Wagner effective media model. In the investigated range of volume fractions the Maxwell-Wagner model correlates well with the data extracted from measurements.
P. Z. Jasinski et al., "Impedance Spectroscopy of BaTiO₃ Cubes Suspended in Lossy Liquids as a Physical Model of Two-phase System," Journal of Applied Physics, American Institute of Physics (AIP), Jan 2010.
The definitive version is available at http://dx.doi.org/10.1063/1.3486461
Materials Science and Engineering
Keywords and Phrases
Barium Compounds; Dielectric Materials; Electrical Conductivity; Equivalent Circuits; Flow Birefringence; Permittivity
Article - Journal
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