Cooling rate effects on the electrical properties of TiO2-based varistor

Hsing I. Hsiang, Shi Shu Wang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The cooling rate effects on the microstructure development and electrical properties of TiO2 ceramics are studied using transmission electron microscopy (TEM), energy dispersion spectrometer (EDS) and X-ray diffractometer (XRD). Barium and bismuth were exsolved during cooling and reacted with rutile to form secondary phases, Ba2Ti9O20 and Bi 2Ti4O11. Therefore, the acceptor concentration of Bi+3 (BiTi′) in the rutile grain near the grain boundary areas in furnace-cooled samples were lower than that in quenched samples. As the acceptor concentration decreased, the depletion width and barrier height decreased. Consequently, the quenched samples possessed higher nonlinear exponent (α) values than furnace-cooled samples.

Original languageEnglish
Pages (from-to)25-29
Number of pages5
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume128
Issue number1-3
DOIs
Publication statusPublished - 2006 Mar 15

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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