Thermoelectric properties of Ba-Ge based type-III clathrate compounds

Jung Hwan Kim, Norihiko L. Okamoto, Kyosuke Kishida, Katsushi Tanaka, Haruyuki Inui

研究成果: Conference article査読

3 被引用数 (Scopus)

抄録

The crystal structures and thermoelectric properties of Ba-Ge based type-III clathrate compounds in Ba-Al-Ge and Ba-In-Ge systems have been investigated as a function of Al and In content. The absolute values of electrical resistivity and Seebeck coefficient increase, while that of lattice thermal conductivity decreases with increasing Al and In content. The increase in electrical resistivity and Seebeck coefficient is discussed in terms of the number of the excess electrons deduced from the Zintl concept, on the other hand, the decrease in lattice thermal conductivity is discussed in terms of an anisotropic deformation of the open-dodecahedron cage encapsulating Ba atom. High ZT values of 0.7 and 0.87 are obtained at 780 and 580 °C for Ba 24Al12Ge88 and Ba24In 16Ge84. respectively.

本文言語English
ページ(範囲)217-222
ページ数6
ジャーナルMaterials Research Society Symposium Proceedings
980
出版ステータスPublished - 2007 6 29
外部発表はい
イベント2006 MRS Fall Meeting - Boston, MA, United States
継続期間: 2006 11 272006 11 29

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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