- 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.