Abstract
Magnesia-graphite composite ceramics were fabricated by hot pressing in Ar atmosphere, and their electrical properties were measured. The electrical resistivity increases as the graphite volume fraction x decreases, following well-accepted power law model based on the percolation theory. Renormalized pressure coefficient of resistance, d(ln R)/dP, decreases as x decreases. This behavior can be explained by the strong enhancement of d(ln p)/dx toward the percolation threshold. By fitting the x dependence of d(ln R)/dP with a theoretical equation, the Young's modulus of the composites was estimated.
| Original language | English |
|---|---|
| Pages (from-to) | 793-796 |
| Number of pages | 4 |
| Journal | Journal of the Ceramic Society of Japan |
| Volume | 117 |
| Issue number | 1367 |
| DOIs | |
| Publication status | Published - Jul 2009 |
Keywords
- Composite
- Graphite
- Magnesia
- Percolation
- Piezoresistivity
- Young's modulus
ASJC Scopus subject areas
- Ceramics and Composites
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry
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Waku, K., Tagaya, S., Hayashi, H., & Kishimoto, A. (2009). Piezoresistivity of magnesia-graphite composite ceramics. Journal of the Ceramic Society of Japan, 117(1367), 793-796. https://doi.org/10.2109/jcersj2.117.793