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High-temperature thermoelectric properties of n-type BayNixCo4−xSb12

Published online by Cambridge University Press:  31 January 2011

X. F. Tang ,
L. M. Zhang ,
R. Z. Yuan ,
L. D. Chen ,
T. Goto ,
T. Hirai ,
J. S. Dyck ,
W. Chen  and
C. Uher
X. F. Tang
Affiliation:
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
L. M. Zhang
Affiliation:
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
R. Z. Yuan
Affiliation:
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
L. D. Chen
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Structure, Shanghai Institute of Ceramics, CAS, Shanghai 200050, China
T. Goto
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
T. Hirai
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan
J. S. Dyck
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109
W. Chen
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109
C. Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109
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Abstract

Effects of Ba filling fraction and Ni content on the thermoelectric properties of n-type BayNixCo4−xSb12 (x = 0−0.1, y = 0−0.4) were investigated at temperature range of 300 to 900 K. Thermal conductivity decreased with increasing Ba filling fraction and temperature. When y was fixed at 0.3, thermal conductivity decreased with increasing Ni content and reached a minimum value at about x = 0.05. Lattice thermal conductivity decreased with increasing Ni content, monotonously (y ≤ 0.1). Electron concentration and electrical conductivity increased with increasing Ba filling fraction and Ni content. Seebeck coefficient increased with increasing temperature and decreased with increasing Ba filling fraction and Ni content. The maximum ZT value of 1.25 was obtained at about 900 K for n-type Ba0.3Ni0.05Co3.95Sb12.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3343 - 3346
Copyright
Copyright © Materials Research Society 2001

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