Abstract
The reduction of grain size from the microcrystalline regime into the nanocrystalline regime is known to produce significant changes in the transport properties of polycrystalline ceramics. Part 1 of this series described the development of a pixel-based finite-difference "nested-cube model" (NCM), which was used to evaluate existing composite models for the electrical/dielectric properties of polycrystalline ceramics over the entire range of grain core vs. grain boundary volume fractions, from the nanocrystalline regime to the microcrystalline regime. Part 2 addresses grain shape and periodicity effects in such composite modeling, and the extraction of local materials properties (conductivity, dielectric constant) from experimental impedance/dielectric spectroscopy data.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 293-301 |
| Number of pages | 9 |
| Journal | Journal of Electroceramics |
| Volume | 14 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jul 2005 |
Funding
This work was supported in part by the U.S. Department of Energy under grant no. DE-FG02-84ER45097 and in part by the National Science Foundation under grant no. DMR-0076097 through the Materials Research Science and Engineering Center program.
Keywords
- Brick layer model
- Dielectric
- Effective medium
- Impedance
- Nested cube model
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Mechanics of Materials
- Electrical and Electronic Engineering
- Materials Chemistry