Electrical characterization of slurries prepared by mixing dielectric powders with solvents can be used to estimate dielectric properties of the particles. In particular, dielectric constant of the particles can be calculated from effective dielectric constant of the slurry measured at high frequency by using the Lorentz-Lorenz or similar equations based on mixing rules. Unfortunately, this approach leads to high margin of errors in dielectric constant estimation and is very sensitive to any slurry nonidealities such as sedimentation or agglomeration of particles. Impedance spectroscopy techniques are introduced to measure dielectric properties of particles at different frequency ranges. Dielectric constant of strontium titanate particles, suspended in butoxyethanol, was determined reproducibly by impedance spectroscopy using an appropriate equivalent circuit model.
V. Petrovsky et al., "Dielectric Constant of Particles Determined by Impedance Spectroscopy," Journal of Applied Physics, American Institute of Physics (AIP), Jul 2006.
The definitive version is available at http://dx.doi.org/10.1063/1.2206411
Materials Science and Engineering
National Science Foundation (U.S.)
United States. Office of Naval Research
Keywords and Phrases
Electric Impedance; High-Frequency Effects; Permittivity; Slurries; Strontium compounds
Article - Journal
© 2006 American Institute of Physics (AIP), All rights reserved.