Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Synthesis and Characterization of Delafossite $CuLaO_2$ for Thermoelectric Application

  • Takahashi, Yuhsuke (Dept. of Materials Chemistry, School of High-Technology for Human Welfare, Tokai University) ;
  • Matsushita, Hiroaki (Dept. of Information and Communication Technology, School of High-Technology for Human Welfare, Tokai University) ;
  • Katsui, Akinori (Dept. of Materials Chemistry, School of High-Technology for Human Welfare, Tokai University)
  • Published : 2006.09.24
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Abstract

The preparation of single-phase $CuLaO_2$ with delafossite-type structure by means of the solid-state reaction method was investigated using X-ray diffraction. The results showed that notwhistanding the fact that there was a trace of metallic copper, nearly single-phase $CuLaO_2$ was obtained by using $La(OH)_3$ as a lanthanum source and by firing the mixed powder with nonstoichiometric composition ratio of $La(OH)_3:Cu_2O=1:1.425$ in a vacuum at 1273 K for 10 h. The measurement of electrical conductivity and Seebeck coefficient showed that $CuLaO_2$ thus obtained was a p-type semiconductor and had a Seebeck coefficient of approximately $70{\mu}V/K$.

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