Metals and Materials International

, Volume 16, Issue 1, pp 99–107 | Cite as

PTCR characteristics and microstructure of porous (Ba,Sr)TiO3 ceramics prepared by spark plasma sintering

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Abstract

Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few μm and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 × 106, which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

Keywords

electrical properties sintering microstructure grain boundary grain growth 
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Copyright information

© The Korean Institute of Metals and Materials and Springer Netherlands 2010

Authors and Affiliations

  • Ki-Ju Lee
    • 1
  • Dongxu Tang
    • 1
  • K. Park
    • 2
  • Won-Seung Cho
    • 1
  1. 1.School of Materials Science and EngineeringInha UniversityIncheonKorea
  2. 2.Nanotechnology and Advanced Materials EngineeringSejong UniversitySeoulKorea

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