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J. Korean Ceram. Soc. > Volume 47(1); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(1): 71.
doi: https://doi.org/10.4191/kcers.2010.47.1.071
Grain Boundary Protonic Conductivity in Highly Dense Nano-crystalline Y-doped BaZrO3
Hee-Jung Park, Zuhair A. Munir, Sang-Tae Kim
Department of Chemical Engineering and Materials Science, University of California
We have investigated protonic conduction in highly dense (>98%) polycrystalline Y-doepd $BaZrO_3$ (BYZ) ceramic with an average grain size of ~85 nm. It is observed that the protonic conductivity across the grain boundaries in this nano-crystallilne BYZ (n-BYZ) is significantly higher than the microcrystalline counterpart. Such a remarkable enhancement in grain boundary conductivity results in high overall conductivity that may allow this chemically stable protonic conductor to serve as a solid electrolyte for low-temperature solid oxide fuel cell applications.
Key words: Proton conductors, $BaZrO_3$, Nanocrystallline ceramics, Grain boundary conductivity, Spark plasma sintering
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