Abstract
Single-crystalline samples of type-VIII clathrate Ba8Ga 16-xAlxSn30 (0≤x≤12) were grown from Sn flux to characterize the structural and thermoelectric properties from 300 to 600 K. The lattice parameter increases by 0.5% as x is increased to 10.5 whose value is the solubility limit of Al. The Seebeck coefficients of all samples are largely negative and the absolute values increase to approximately 300 μV/K on heating to 600 K. This large thermopower coexists with the metallic behavior in the electrical resistivity. The values of resistivity for 1≤x≤6 at 300 K are in the range 3.3-3.8 mωcm which is 70% of that for x=0. As a result, the power factor for x=4 and 6 has a rather large maximum of 1.83× 10-3 W/m K2 at 480 K. The thermal conductivity stays at a low level of 0.72 W/mK up to 480 K, and the sample with x=6 reaches a ZT value of 1.2 at 500 K.
| Original language | English |
|---|---|
| Article number | 073705 |
| Journal | Journal of Applied Physics |
| Volume | 108 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Oct 1 2010 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
Enhancement of thermoelectric efficiency in type-VIII clathrate Ba 8Ga16Sn30 by Al substitution for Ga. / Deng, Shukang; Saiga, Yuta; Suekuni, Koichiro; Takabatake, Toshiro.
In: Journal of Applied Physics, Vol. 108, No. 7, 073705, 01.10.2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Enhancement of thermoelectric efficiency in type-VIII clathrate Ba 8Ga16Sn30 by Al substitution for Ga
AU - Deng, Shukang
AU - Saiga, Yuta
AU - Suekuni, Koichiro
AU - Takabatake, Toshiro
PY - 2010/10/1
Y1 - 2010/10/1
N2 - Single-crystalline samples of type-VIII clathrate Ba8Ga 16-xAlxSn30 (0≤x≤12) were grown from Sn flux to characterize the structural and thermoelectric properties from 300 to 600 K. The lattice parameter increases by 0.5% as x is increased to 10.5 whose value is the solubility limit of Al. The Seebeck coefficients of all samples are largely negative and the absolute values increase to approximately 300 μV/K on heating to 600 K. This large thermopower coexists with the metallic behavior in the electrical resistivity. The values of resistivity for 1≤x≤6 at 300 K are in the range 3.3-3.8 mωcm which is 70% of that for x=0. As a result, the power factor for x=4 and 6 has a rather large maximum of 1.83× 10-3 W/m K2 at 480 K. The thermal conductivity stays at a low level of 0.72 W/mK up to 480 K, and the sample with x=6 reaches a ZT value of 1.2 at 500 K.
AB - Single-crystalline samples of type-VIII clathrate Ba8Ga 16-xAlxSn30 (0≤x≤12) were grown from Sn flux to characterize the structural and thermoelectric properties from 300 to 600 K. The lattice parameter increases by 0.5% as x is increased to 10.5 whose value is the solubility limit of Al. The Seebeck coefficients of all samples are largely negative and the absolute values increase to approximately 300 μV/K on heating to 600 K. This large thermopower coexists with the metallic behavior in the electrical resistivity. The values of resistivity for 1≤x≤6 at 300 K are in the range 3.3-3.8 mωcm which is 70% of that for x=0. As a result, the power factor for x=4 and 6 has a rather large maximum of 1.83× 10-3 W/m K2 at 480 K. The thermal conductivity stays at a low level of 0.72 W/mK up to 480 K, and the sample with x=6 reaches a ZT value of 1.2 at 500 K.
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U2 - 10.1063/1.3490776
DO - 10.1063/1.3490776
M3 - Article
VL - 108
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 7
M1 - 073705
ER -