Solubility study of Yb in n-type skutterudites YbxCo4Sb12 and their enhanced thermoelectric properties

被引：95
作者：
Yang, J. [2 ]
Hao, Q. [1 ]
Wang, H. [2 ]
Lan, Y. C. [2 ]
He, Q. Y. [2 ,3 ]
Minnich, A. [1 ]
Wang, D. Z. [2 ]
Harriman, J. A. [2 ]
Varki, V. M. [2 ]
Dresselhaus, M. S. [4 ,5 ]
Chen, G. [1 ]
Ren, Z. F. [2 ]
机构：
[1] MIT, Dept Mech Engn, Cambridge, MA 02139 USA
[2] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA
[3] S China Normal Univ, Sch Phys & Telecommun Engn, Guangzhou 510631, Guangdong, Peoples R China
[4] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
[5] MIT, Dept Phys, Cambridge, MA 02139 USA
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 11期
关键词：
TEMPERATURE TRANSPORT-PROPERTIES; LATTICE THERMAL-CONDUCTIVITY; FIGURE-OF-MERIT; FILLED SKUTTERUDITES; PERFORMANCE;
D O I：
10.1103/PhysRevB.80.115329
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The solubility of Yb in YbxCo4Sb12 was reported to be 0.19 in bulk skutterudites made by melting and slow cooling method. Surprisingly we increased x close to 0.5 by a special sample preparation method: ball mill and hot press. We show that a higher Yb concentration not only increases the power factor due to a higher electron concentration but also reduces the thermal conductivity k because of stronger phonon scattering. In this way, we have achieved a dimensionless thermoelectric figure of merit ZT of about 1.2 at 550 degrees C in Yb0.35Co4Sb12.
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页数：5
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