Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3-δ Proton-Conducting Ceramics

Wang, Siwei; Chen, Yan; Zhang, Lingling; Ren, Cong; Chen, Fanglin; Brinkman, Kyle S.

doi:10.1007/s11664-015-4078-9

Title: Two-Step Reactive Aid Sintering of BaZr_0.8Y_0.2O_3-δ Proton-Conducting Ceramics

Journal Article · Wed Oct 14 00:00:00 EDT 2015 · Journal of Electronic Materials

DOI:https://doi.org/10.1007/s11664-015-4078-9· OSTI ID:1265849

Wang, Siwei ^[1]; Chen, Yan ^[2]; Zhang, Lingling ^[3]; Ren, Cong ^[1]; Chen, Fanglin ^[3]; Brinkman, Kyle S. ^[1]

Clemson Univ., SC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of South Carolina, Columbia, SC (United States)

Ceramic-based proton conductors enable high-temperature hydrogen economy applications such as hydrogen separation membranes, fuel cells, and steam electrolyzers. BaZr_0.8Y_0.2O_3-δ (BZY) proton-conducting oxide possesses the highest level of proton conductivity reported to date, but poor sinterability hinders its widespread utilization. Here, we report a two-step reactive aid sintering (TRAS) method involving the introduction of BaCO₃ and B₂O₃-Li₂O for the preparation of dense BZY ceramics sintered at 1500°C. The resulting BZY samples showed a pure perovskite structure with a dramatic increase in the relative density to 91.5%. In addition, the shrinkage during sintering was improved to 19.3% by a TRAS method as compared to 2.6% by the conventional solid date reaction method. Moreover, the bulk conductivity was improved due to enhanced densification, while the grain boundary conductivity decreased due to the blocking behavior of the sintering aid resulting in a decrease in the total conductivity of the samples.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Heterogeneous Functional Materials Center (HeteroFoaM); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0001061

OSTI ID:: 1265849

Journal Information:: Journal of Electronic Materials, Vol. 44, Issue 12; ISSN 0361-5235

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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References (26)

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
proton conductor
solid oxide fuel cells
sinterability
solid-state reactive sintering
sintering aid

Title: Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3-δ Proton-Conducting Ceramics

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Title: Two-Step Reactive Aid Sintering of BaZr_0.8Y_0.2O_3-δ Proton-Conducting Ceramics