Journal of Materials Science

, Volume 30, Issue 13, pp 3395–3400 | Cite as

BaTiO3-based positive temperature coefficient of resistivity ceramics with low resistivities prepared by the oxalate method

  • K. Nozaki
  • M. Kawaguchi
  • K. Sato
  • M. Kuwabara


Positive temperature coefficient of resistivity (PTCR) ceramics with low resistivities at room temperature were obtained by using oxalate-derived barium titanate powders. The average room-temperature resistivity of the PTCR ceramics was 4Ω cm, and the magnitude of their PTCR jump was around four orders with a voltage proof of more than 50 Vmm−1. These PTCR properties are significantly influenced by the calcination temperature of the starting materials and by the resultant properties of the ceramic bodies. The microstructure of such-PTCR ceramics with a low room-temperature resistivity produced in this study was found to be rather heterogeneous. Complex impedance measurements revealed that the resistivity of the present PTCR materials was determined predominantly by the grain-boundary resistance even at room temperature.


Barium Calcination Oxalate Calcination Temperature Complex Impedance 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • K. Nozaki
    • 1
  • M. Kawaguchi
    • 2
  • K. Sato
    • 3
  • M. Kuwabara
    • 4
  1. 1.Department of PhysicsYamaguchi UniversityYamaguchiJapan
  2. 2.Department of Solid State ElectronicsOsaka Electro-Communication UniversityOsakaJapan
  3. 3.Ube Research CenterCentral Glass Co., LtdYamaguchiJapan
  4. 4.Department of Applied Chemistry, Faculty of EngineeringKyushu Institute of TechnologyFukuokaJapan

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