Journal
ACTA MATERIALIA
Volume 87, Issue -, Pages 266-272Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.01.018
Keywords
MgAgSb alloys; Nanostructure; Thermoelectric; Self-compatibility factor
Funding
- US Air Force Office of Scientific Research's MURI program [FA9550-10-1-0533]
- DOE [DE-FG02-13ER46917/DE-SC0010831]
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Recently, MgAgSb was discovered to have good thermoelectric properties. In this paper, we intend to substitute a small amount of Ag by Cu to make MgAg0.97-xCuxSb0.99 (x = 0, 0.003, 0.007, and 0.01) thermoelectric materials aiming to decrease the lattice thermal conductivity without sacrificing the power factor. The results showed that Cu substitution not only reduced the thermal conductivity, but also improved the power factor, consequently led to improved ZT values. Among the MgAg0.97-xCuxSb0.99. samples, MgAg0.963Cu0.007Sb0.99 showed the highest ZT values of 0.95 at room temperature and 1.32 at 250 degrees C. In addition, the MgAgSb-based samples displayed much better self-compatibility factors than Bi0.4Sb1.6Te3. The effect of grain orientation on the anisotropy of thermoelectric properties of MgAg0.97Sb0.99 has also been studied. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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