- Author
-
Coverdale, R. T.
|
Jennings, H. M.
|
Garboczi, E. J.
- Title
- Improved Model for Simulating Impedance Spectroscopy.
- Coporate
- Northwestern Univ., Evanston, IL
National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Computational Materials Science,
Vol. 3,
465-474,
1995
- Keywords
-
building technology
|
impedance spectroscopy
- Abstract
- A numerical method for simulating the frequency-dependent impedance response of multi-phase composite materials has been developed. The algorithm takes as input (1) a digital image of a microstructure, in two or three dimensions, of any specified composite material, and (2) the frequency-dependent electrical properties of the individual phases of the composite. An impedance spectrum of any frequency range can then be computed using a conjugate gradient algorithm operating on a finite difference solution scheme of Laplace's equation. Examples are given of the impedance of analytically solvable microstructures, to validate the algorithm, and of a random system, to test the usefulness of two different effective medium theories.