Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 521, Issue -, Pages 141-145Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.01.093
Keywords
Thermoelectric; Composite; Skutterudite
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Funding
- National Natural Science Foundation of China [50972047, 50827204, 51072062]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Fundamental Research Funds for the Central Universities [2011TS124, HUST]
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In this work we have synthesized In0.2+xCo4Sb12+x samples using a melting-annealing-hot pressing procedure, with the In and Sb contents concomitantly varied. The microstructures and thermoelectric properties have been subsequently studied and correlated. Increasing x value leads to an increase of the electrical conductivity, a decrease of the Seebeck coefficient in magnitude, and non-monotonic changes in the power factor and the lattice thermal conductivity. In particular, we have for the first time observed the InSb/Sb eutectic formation through thermal analysis when x is well above 0.2. The high density of interfaces via the formation of InSb/Sb mixture on the grain boundaries seems to decrease the lattice thermal conductivity and accounts for a dimensionless figure of merit, ZT, of 1.0 in In0.8Co4Sb12.6 at 650 K. (C) 2012 Elsevier B.V. All rights reserved.
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