Journal
ACTA MATERIALIA
Volume 91, Issue -, Pages 227-238Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.03.008
Keywords
Thermoelectric materials; Nanostructured materials transport properties; Severe plastic deformation; Transmission electron microscopy
Funding
- Austrian Christian Doppler Laboratory for Thermoelectricity
- FWF [P24380]
- Austrian Science Fund (FWF) [P24380] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 24380] Funding Source: researchfish
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The best p-type skutterudites so far are didymium filled, Fe/Co substituted, Sb-based skutterudites. Substitution at the Sb-sites influences the electronic structure, deforms the Sb-4-rings, enhances the scattering of phonons on electrons and impurities and in this way reduces the lattice thermal conductivity. In this paper we study structural and transport properties of p-type skutterudites with the nominal composition DD0.7Fe2.7Co1.3Sb11.7{Ge/Sn}(0.3), which were prepared by a rather fast reaction annealing melting technique. The Ge-doped sample showed impurities, which did not anneal out completely and even with ZT > 1 the result was not satisfying. However, the single-phase Sn-doped sample, DD0.7Fe2.3Co1.3Sb11.8Sn0.2, showed a lower thermal and lattice thermal conductivity than the undoped skutterudite leading to a higher ZT = 1.3, hitherto the highest ZT for a p-type skutterudite. Annealing at 570 K for 3 days proved the stability of the microstructure. After severe plastic deformation (SPD), due to additionally introduced defects, an enhancement of the electrical resistivity was compensated by a significantly lower thermal conductivity and the net effect led to a record high figure of merit: ZT = 1.45 at 850 K for DD0.7Fe2.7CO1.3Sb11.8Sn0.2. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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