Splitting of guest atom sites and lattice thermal conductivity in Ba-Ga-Ge clathrate compounds

Norihiko L. Okamoto, Katsushi Tanaka, Haruyuki Inui

研究成果: Conference contribution

1 引用 (Scopus)

抜粋

The crystal structures of some type-I and -III clathrate compounds in the Ba-Ga-Ge system have been investigated by synchrotron X-ray powder diffraction at room temperature, paying special attention to the changes of the cage structure and the splitting behavior at the guest atom site upon alloying with Ga. For both types of the clathrate compounds, the split distance of the Ba(2) sites increases with the increase in the Ga content, corresponding to the change in the size and shape of the encapsulating polyhedral cage. Lattice thermal conductivity at room temperature has a positive correlation with the atomic displacement parameter (ADPsplit) based on the split-site model but has an inverse correlation with the split distance of the Ba(2) sites, indicating that a dominant factor of reducing the lattice thermal conductivity is not thermal vibration at the split sites but thermal jump among the split sites.

元の言語English
ホスト出版物のタイトルMaterials Research Society Symposium Proceedings
ページ407-412
ページ数6
出版物ステータスPublished - 2006 5 8
外部発表Yes
イベント2005 Materials Research Society Fall Meeting - Boston, MA, United States
継続期間: 2005 11 282005 12 1

出版物シリーズ

名前Materials Research Society Symposium Proceedings
886
ISSN(印刷物)0272-9172

Other

Other2005 Materials Research Society Fall Meeting
United States
Boston, MA
期間05/11/2805/12/1

ASJC Scopus subject areas

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

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  • これを引用

    Okamoto, N. L., Tanaka, K., & Inui, H. (2006). Splitting of guest atom sites and lattice thermal conductivity in Ba-Ga-Ge clathrate compounds. : Materials Research Society Symposium Proceedings (pp. 407-412). (Materials Research Society Symposium Proceedings; 巻数 886).