|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XVI
||Dependence of Grain Size Distribution on the Conductivity of Ceria - Approach by Spark Plasma Sintering
||Po-Heng Lin, Eric Tseng, Shih-Yun Chen, Yang-Yuan Chen
|On-Site Speaker (Planned)
Solid oxide fuel cells (SOFCs) have potential to be the cleanest devices for cost-effective conversion to electricity from various fuels. Among the promising electrolyte materials for SOFCs, doped ceria (DCO) has attracted great attention, due to its superior ionic conductivity at intermediate temperatures. However, the poor sinterability of DCO materials results in undesired grain growth and interfacial reactions, both weaken the conductivity of bulk. To improve the sinterability of DCO powders and optimize the electrode microstructure, a unique process, Spark Plasma Sintering (SPS) was utilized to sinter ceria raw powders of different sizes in this study. The relationships between grain growth, defect transformation caused by sintering and the conductivity were clarified. A decrease in grain size and defect-rich surface account for the improvement of conductivity, which was raised by two orders of magnitude. This report will also discuss optimized parameters to further improve the relative density of SPS bulks.
||Planned: Supplemental Proceedings volume