The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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A New Class of NTC Thermistors

  • Kato, Kazuya (CRL, Nagoya Institute of Technology, Tajimi, 507, Japan Shizuoka University) ;
  • Ota, Toshitaka (CRL, Nagoya Institute of Technology, Tajimi, 507, Japan Shizuoka University) ;
  • Hikichi, Yasuo (CRL, Nagoya Institute of Technology, Tajimi, 507, Japan Shizuoka University) ;
  • Unuma, Hidero (CRL, Nagoya Institute of Technology, Tajimi, 507, Japan Shizuoka University) ;
  • Takahashi, Minoru (CRL, Nagoya Institute of Technology, Tajimi, 507, Japan Shizuoka University) ;
  • Suzuki, Hisao (CRL, Nagoya Institute of Technology, Tajimi, 507, Japan Shizuoka University)
  • Published : 2000.06.01
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Abstract

VO$_2$ceramics exhibiting a negative temperature coefficient (NTC) of resistivity have been widely used as temperature dependence resistors. The NTC effect similar to $VO_2$ceramics was observed when a low-thermal-expansion ceramic matrix was loaded near the percolation threshold with conductive metal particles. The resistivity in a composite made from silica glass and 20 vol% Ag filler suddenly decreased from $10^{-7}$ to $10^3\;\Omega$cm at about $300^{\circ}C$.

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References

  1. Trans.I.E.E.E. Poly Swicth PTC Device-A New Low-Resis tance Conductive Polymer-Based PTC Device for Overcurrent Protection F.A.Doljack
  2. Polym.Eng.Sci. v.13 Glass Transition Temperature as a Guide to Selection of Polymers Suitable for PTC Materials J.Meyer
  3. Rev.Mod.Phys. v.45 Percolation and Conduction S.Kirkpatrik