Thermoelectric properties of double-filled skutterudites Ca 1-xlaxFe4-yCoySb12

S. Narazu, Y. Hadano, K. Suekuni, T. Takabatake, K. Suzuki, H. Anno

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

To study the effect of double filling of the skutterudite iron antimonides on the thermal conductivity, we have synthesized dense samples of Ca 1-xLaxFe4Sb12 (0 ≤ × ≤ 1) and Ca0.3La0.6Fe4-yCOySb 12 (y = 1, 1.5) by the spark plasma sintering technique. Electron-probe microanalysis revealed that the double-filled samples with x = 0.25, 0.5, and 0.75 consist of three phases of micrometer scale; CaFe 4Sb12, Ca-rich phase, and La-rich phase, respectively. The lattice thermal conductivity at 150 K is smaller by 10-20% than that for the end compounds. This is attributable to the scattering of heat conducting phonons by the local fluctuations in both mass and charge of Ca2+ and La3+ ions. In the full range of x from 0 to 1, the thermopower at 300 K stays at 70 μV/K. This value was increased to 120 μV/K by partial substitution of Co for Fe. The dimensionless figure of merit ZT for Ca 0.3La0.6Fe3CoSb12 is estimated to be 0.9 at 800 K, which is comparable to the value reported for p-type Ce 0.44Yb0.32Fe3CoSb12.

本文言語英語
ホスト出版物のタイトルProceedings ICT'07 - 26th International Conference on Thermoelectrics
ページ197-199
ページ数3
DOI
出版ステータス出版済み - 2007
外部発表はい
イベントICT'07 - 26th International Conference on Thermoelectrics - Jeju, 大韓民国
継続期間: 6 3 20076 7 2007

出版物シリーズ

名前International Conference on Thermoelectrics, ICT, Proceedings

その他

その他ICT'07 - 26th International Conference on Thermoelectrics
Country大韓民国
CityJeju
Period6/3/076/7/07

All Science Journal Classification (ASJC) codes

  • Engineering(all)

フィンガープリント 「Thermoelectric properties of double-filled skutterudites Ca <sub>1-x</sub>la<sub>x</sub>Fe<sub>4-y</sub>Co<sub>y</sub>Sb<sub>12</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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