Piezoresistivity of magnesia-graphite composite ceramics

Kiminori Waku, Shuuhei Tagaya, Hidetaka Hayashi, Akira Kishimoto

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 languageEnglish
Pages (from-to)793-796
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume117
Issue number1367
DOIs
Publication statusPublished - 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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