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

Research output: Contribution to journalArticle

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

Fingerprint

Phase stability
Barium
barium
sintering
Protons
Sintering
conduction
atmospheres
electrical resistivity
protons
Evaporation
evaporation
conductivity
vaporizing
Vaporization
Partial pressure
partial pressure
Electric Conductivity
Decomposition
decomposition

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

Cite this

Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu 0.01)O3-δ . / Lee, Jong Ho; Choi, Sung Min; Lee, Jong Heun; Hong, Jongsup; Kim, Hyounchul; Yoon, Kyung Joong; Kim, Byung Kook.

In: International Journal of Hydrogen Energy, Vol. 39, No. 13, 24.04.2014, p. 7100-7108.

Research output: Contribution to journalArticle

Lee, Jong Ho ; Choi, Sung Min ; Lee, Jong Heun ; Hong, Jongsup ; Kim, Hyounchul ; Yoon, Kyung Joong ; Kim, Byung Kook. / Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu 0.01)O3-δ In: International Journal of Hydrogen Energy. 2014 ; Vol. 39, No. 13. pp. 7100-7108.
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AU - Lee, Jong Heun

AU - Hong, Jongsup

AU - Kim, Hyounchul

AU - Yoon, Kyung Joong

AU - Kim, Byung Kook

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N2 - 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.

AB - 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.

KW - Barium evaporation

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