Effects of Synthesis and Spark Plasma Sintering Conditions on the Thermoelectric Properties of Ca3Co4O9+δ

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• 作者：NingYu Wu (1)
  Tim C. Holgate (1)
  Ngo Van Nong (1)
  Nini Pryds (1)
  S?ren Linderoth (1)
  
• 关键词：Thermoelectric ; spark plasma sintering ; Ca3Co4O9+δ ; solid ; state reaction ; sol–gel reaction
• 刊名：Journal of Electronic Materials
• 出版年：2013
• 出版时间：July 2013
• 年：2013
• 卷：42
• 期：7
• 页码：2134-2142
• 全文大小：1717KB
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• 作者单位：NingYu Wu (1)
  Tim C. Holgate (1)
  Ngo Van Nong (1)
  Nini Pryds (1)
  S?ren Linderoth (1)
  
  1. Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark
  
• ISSN：1543-186X

文摘

Ca3Co4O9+δ samples were synthesized by solid-state (SS) and sol–gel (SG) reactions, followed by spark plasma sintering under different processing conditions. The synthesis process was optimized and the resulting materials characterized with respect to their microstructure, bulk density, and thermoelectric transport properties. High power factors of about 400?μW/m·K2 and 465?μW/m·K2 (at 800°C) were measured for SS and SG samples, respectively. The improved thermoelectric performance of the SG sample is believed to originate from the smaller particle sizes and better grain alignment. The SG method is suggested to be a beneficial means of obtaining high-performance thermoelectric materials of Ca3Co4O9+δ type.