Thermoelectric properties of delafossite-type oxide CuFe1-xNixO2 (0 ≤ x ≤ 0.05)

Tomohiro Nozaki, Kei Hayashi, Tsuyoshi Kajitani

研究成果: Article査読

29 被引用数 (Scopus)

抄録

We have studied crystal structure and high temperature thermoelectric properties of delafossite-type oxide CuFe1-xNixO2, (0≤ x≤ 0.05). There is no significant difference in the lattice parameter α among the Ni-doped samples and CuFeO2 due to the decrease of Fe-O distance and simultaneous increase of O-Fe-O angle by the Ni doping. The lattice parameter c is slightly longer in the doped samples than that of CuFeO2, reflecting the increase of Cu-O distance. The decrease of the Fe-O distance indicates hole doping in the Fe-site. Because of the hole doping, the electrical conductivity σ is enhanced to 18 S/cm. The Seebeck coefficient S decreases slightly by the Ni doping, but remains high (S > 250 μ V/K). The obtained Seebeck coefficient at high temperature agrees well with theoretical values based on the generalized Heikes formula that takes the spin entropy flux into account. The thermal conductivity κ of CuFe1-xNixO2 is relatively high (κ>4 W/mK). The maximum ZT value, ZT = σS2T/K = 0.14 is obtained with the sample of x = 0.01 at 1100 K.

本文言語English
ページ(範囲)1205-1209
ページ数5
ジャーナルJOURNAL of CHEMICAL ENGINEERING of JAPAN
40
13
DOI
出版ステータスPublished - 2007 12 27

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)

フィンガープリント

「Thermoelectric properties of delafossite-type oxide CuFe<sub>1-x</sub>Ni<sub>x</sub>O<sub>2</sub> (0 ≤ x ≤ 0.05)」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。

引用スタイル