High-temperature electrical transport behaviors in textured Ca3Co4O9-based polycrystalline ceramics
作者： Yuan-Hua Lin , Jinle Lan , Zhijian Shen , Yuheng Liu , Ce-Wen Nan
DOI: 10.1063/1.3086875
关键词:
摘要: Highly (00l) oriented Ca3Co4O9-based ceramics were fabricated by spark plasma sintering combined with a dynamic forging process. The grain orientation is effective in lowering the electrical resistivity and enhancing thermoelectric power factor but little influence on Seebeck coefficient. A metallic-to-semiconducting transition temperature can be observed activation energy almost independent of La-doping. All ceramic samples exhibit large power, figure merit for La-doped Ca3Co4O9 sample reach 0.26 at 975 K, which promising candidate p-type material high-temperature application.
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