Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3-δ
- Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3-δ
- 최성민; 이종흔; 홍종섭; 김형철; 윤경중; 김병국; 이종호
- SOFC; Proton-conducting oxide; Barium evaporation; Phase stability; Electrical conductivity; Y2O3 segregation
- Issue Date
- International journal of hydrogen energy
- VOL 39, NO 13, 7100-7108
- The phase stability and electrical conductivity of a proton-conducting oxide,
Ba(Zr0.84Y0.15Cu0.01)O3-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 ℃, 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.
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