Thermal conductivity and guest vibration in cage-size controlled Ba 8in16Ge30-xMx (M=Si, Sn)

K. Suekuni, S. Yamamoto, M. A. Avila, T. Takabatake

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

We report thermal and transport measurements on single crystalline samples of Ba8In16Ge30-xMx (M=Si, Sn, x ≤, 2.2), which crystallize in the type-I clathrate structure. On going from Mx = Si 1.6 to Mx = Sn2.2, the lattice parameter increases by 1% from 11.20 to 11.30 Å. All the samples show semi-metallic behavior with n-type majority carries. The analysis of the specific heat indicates that the local vibration energy of the Ba guests in the tetrakaidecahedron decreases from 39 to 35 K with the increase of the lattice parameter. Concomitantly, the lattice thermal conductivity is largely suppressed and that for Mx = Sn2.2 shows a glasslike temperature dependence. The phonon scattering is greatly increased as a consequence of the strengthened coupling between guest vibration and the cage's acoustic phonon.

Original languageEnglish
Title of host publicationProceedings ICT'07 - 26th International Conference on Thermoelectrics
Pages234-236
Number of pages3
DOIs
Publication statusPublished - Dec 1 2007
Externally publishedYes
EventICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of
Duration: Jun 3 2007Jun 7 2007

Publication series

NameInternational Conference on Thermoelectrics, ICT, Proceedings

Other

OtherICT'07 - 26th International Conference on Thermoelectrics
CountryKorea, Republic of
CityJeju
Period6/3/076/7/07

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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