Dependence of Al2O3 coating thickness and annealing conditions on microstructural and electrochemical properties of LiCoO 2 film

Sun Gyu Park, Seong Rae Lee, Won Il Cho, Byung Won Cho

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 and mu;m 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 and times; 10 6 , 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.

Original languageEnglish
Pages (from-to)93-98
Number of pages6
JournalMetals and Materials International
Volume16
Issue number1
DOIs
Publication statusPublished - 2010 Feb 1

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Keywords

  • Electrical properties
  • Grain boundary
  • Grain growth
  • Microstructure
  • Sintering

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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