Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3-δ

Title
Effect of sintering atmosphere on phase stability, and electrical conductivity of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3-δ
Authors
최성민이종흔홍종섭김형철윤경중김병국이종호
Keywords
SOFC; Proton-conducting oxide; Barium evaporation; Phase stability; Electrical conductivity; Y2O3 segregation
Issue Date
2014-04
Publisher
International journal of hydrogen energy
Citation
VOL 39, NO 13, 7100-7108
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/47419
ISSN
03603199
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KIST Publication > Article
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