Electrical characteristics of (Pb,Sr)TiO3 positive temperature coefficient ceramics

Yuh Yih Lu, Tseung-Yuen Tseng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Electrical properties of the positive temperature coefficient of resistance (PTCR) ceramics of compositions PbxSr0.994-xY0.006TiO3 (x = 0.5, 0.6 and 0.7) with Curie point over 140°C up to 280°C were studied. The built-in potentials formed at grain boundaries in these ceramics were determined on the basis of the Heywang model. These built-in potentials are found to increase with increasing temperature and contribute to the PTCR effect of the ceramics. The resistances of grain and grain boundary of the ceramics were studied using the complex-plane impedance method. It is clearly observed that the grain resistance of the ceramic is much smaller compared to its grain boundary resistance and the change in resistivity with temperature is contributed mainly by the variation of grain boundary resistance.

Original languageEnglish
Pages (from-to)132-137
Number of pages6
JournalMaterials Chemistry and Physics
Volume53
Issue number2
DOIs
StatePublished - 1 Jan 1998

Keywords

  • Built-in potentials
  • Complex-plane impedance method
  • Heywang model
  • Positive temperature coefficient of resistance

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