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 language | English |
|---|---|
| Title of host publication | Proceedings ICT'07 - 26th International Conference on Thermoelectrics |
| Pages | 234-236 |
| Number of pages | 3 |
| DOIs | |
| Publication status | Published - Dec 1 2007 |
| Externally published | Yes |
| Event | ICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of Duration: Jun 3 2007 → Jun 7 2007 |
Publication series
| Name | International Conference on Thermoelectrics, ICT, Proceedings |
|---|
Other
| Other | ICT'07 - 26th International Conference on Thermoelectrics |
|---|---|
| Country | Korea, Republic of |
| City | Jeju |
| Period | 6/3/07 → 6/7/07 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
Cite this
Thermal conductivity and guest vibration in cage-size controlled Ba 8in16Ge30-xMx (M=Si, Sn). / Suekuni, K.; Yamamoto, S.; Avila, M. A.; Takabatake, T.
Proceedings ICT'07 - 26th International Conference on Thermoelectrics. 2007. p. 234-236 4569467 (International Conference on Thermoelectrics, ICT, Proceedings).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Thermal conductivity and guest vibration in cage-size controlled Ba 8in16Ge30-xMx (M=Si, Sn)
AU - Suekuni, K.
AU - Yamamoto, S.
AU - Avila, M. A.
AU - Takabatake, T.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=51849150845&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=51849150845&partnerID=8YFLogxK
U2 - 10.1109/ICT.2007.4569467
DO - 10.1109/ICT.2007.4569467
M3 - Conference contribution
AN - SCOPUS:51849150845
SN - 9781424422623
T3 - International Conference on Thermoelectrics, ICT, Proceedings
SP - 234
EP - 236
BT - Proceedings ICT'07 - 26th International Conference on Thermoelectrics
ER -