Structure and thermoelectric properties of the n-type clathrate Ba8Cu5.1Ge40.2Sn0.7
We study type I clathrate Ba8Cu5.1Ge40.2Sn0.7 single crystals (space group Pm3"n, no. 223, a 1?4 10.7151(3)) grown using a Sn flux method. Microprobe analysis and single-crystal X-ray diffraction reveal a small amount of Sn embedded in the Cu/Ge framework, which increases disorder at the guest Ba sites. Ba8Cu5.1Ge40.2Sn0.7 is diamagnetic with a susceptibility of $2.8 10 7 emu g 1 and shows metal-like behavior (dr/dT > 0) with a low charge carrier concentration of 0.5 e per unit cell at 300 K. The single crystals show a relatively high carrier mobility (m (300 K) 1?4 11.9 cm2 V 1) and very low lattice thermal conductivity ($0.6 W m 1 K 1). The thermoelectric figure of merit ZT of Ba8Cu5.1Ge40.2Sn0.7 single crystals reaches a maximum value of 0.6 at 773 K, which can be further improved by adjusting the chemical composition.
We study type I clathrate Ba8Cu5.1Ge40.2Sn0.7 single crystals [space group Pm [3] over barn, no. 223, a = 10.7151[3]] grown using a Sn flux method. Microprobe analysis and single-crystal X-ray diffraction reveal a small amount of Sn embedded in the Cu/Ge
Wu, JZ [Wu, Jiazhen][ 2 ]、Tanabe, YC [Tanabe, Yoichi][ 3 ]、Xu, JT [Xu, Jingtao][ 1 ]、Heguri, S [Heguri, Satoshi][ 2 ]、Liu, YF [Liu, Yongfu][ 1 ]、Liu, GQ [Liu, Guo-Qiang][ 1 ]、Jiang, HC [Jiang, Haochuan][ 1 ]、Jiang, J [Jiang, Jun][ 1 ]、Tanigaki, K [Tanigaki, Katsumi][ 2,3 ]、Shao, HZ [Shao, Hezhu][ 1 ]
晶体学物理学
RYSTAL-STRUCTURECU
Wu, JZ [Wu, Jiazhen][ 2 ],Tanabe, YC [Tanabe, Yoichi][ 3 ],Xu, JT [Xu, Jingtao][ 1 ],Heguri, S [Heguri, Satoshi][ 2 ],Liu, YF [Liu, Yongfu][ 1 ],Liu, GQ [Liu, Guo-Qiang][ 1 ],Jiang, HC [Jiang, Haochuan][ 1 ],Jiang, J [Jiang, Jun][ 1 ],Tanigaki, K [Tanigaki, Katsumi][ 2,3 ],Shao, HZ [Shao, Hezhu][ 1 ].Structure and thermoelectric properties of the n-type clathrate Ba8Cu5.1Ge40.2Sn0.7[EB/OL].(2017-05-02)[2025-08-02].https://chinaxiv.org/abs/201705.00576.点此复制
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