High-temperature electrical transport and thermoelectric power of partially substituted Ca3Co4O9-based ceramics

Yuan Hua Lin*, Ce Wen Nan, Yuheng Liu, Jingfeng Li, T. Mizokawa, Zhijian Shen

*この研究の対応する著者

研究成果: Article査読

77 被引用数 (Scopus)

抄録

We present high-temperature electrical transport and thermoelectric power of K and/or La-doped Ca3Co4O9-based ceramics. Temperature and doping dependence of electrical transport properties indicate that both K and La substitutions can increase electrical conductivity at a high temperature, which are mainly related to an increase in carrier concentration and carrier mobility. A metallic-to-semiconducting transition temperature (T*) can be observed and shifts to a lower temperature as the doping content increases. However, activation energy is almost independent of the doping. All of the samples show positive thermoelectric power, and the temperature dependence of the thermoelectric power exhibits a simple linear behavior at T>T*. Our experimental data indicate that all of the Ca3 Co4C9-based ceramic samples exhibit large thermoelectric power (∼ 120 to 180 μV/K).

本文言語English
ページ(範囲)132-136
ページ数5
ジャーナルJournal of the American Ceramic Society
90
1
DOI
出版ステータスPublished - 2007 1月
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料化学

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