Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu 0.01)O3-δ

Jong Ho Lee, Sung Min Choi, Jong Heun Lee, Jongsup Hong, Hyounchul Kim, Kyung Joong Yoon, Byung Kook Kim

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18 Citations (Scopus)

Abstract

The phase stability and electrical conductivity of a proton-conducting oxide, Ba(Zr0.84Y0.15Cu0.01)O 3-δ (BZYCu), sintered under various atmospheres was systematically investigated. The partial pressures of oxygen (PO2) and barium (PBa) were used as the tunable experimental parameters to control the surrounding atmosphere during sintering. According to the analysis, the potentially volatile species BaCO3, formed by the decomposition of BZYCu under a CO2-containing atmosphere at around 600 °C, was found to induce barium losses by evaporation. These barium losses, and the associated Y2O3 segregation, were the decisive factor in determining the phase stability and electrical conductivity of the resulting BZYCu; both of these properties deteriorated with barium evaporation. Maintaining the optimum balance of PO2 and PBa during sintering is crucial for minimizing Y2O3 segregation by kinetically suppressing the volatilization of barium.

Original languageEnglish
Pages (from-to)7100-7108
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number13
DOIs
Publication statusPublished - 2014 Apr 24

Keywords

  • Barium evaporation
  • Electrical conductivity
  • Phase stability
  • Proton-conducting oxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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