Publikationen

Nanostructuring as a tool to adjust thermal expansion in high ZT skutterudites

Autor(en)
G. Rogl, J. Bursik, A. Grytsiv, S. Puchegger, V. Soprunyuk, W. Schranz, X. Yan, E. Bauer, Peter Franz Rogl
Abstrakt

Although filled skutterudites have a high figure of merit, ZT, it is still an aim to further improve their thermoelectric behavior. One successful route is to homogeneously disperse nanoparticles into the skutterudite matrix and thereby to reduce the lattice thermal conductivity without disturbing the electrical conductivity and the Seebeck coefficient. In this work Ta0.8Zr0.2B was dispersed into n-type (Mm,Sm)(y)Co4Sb12 powder by ball-milling or high energy ball-milling prior to hot-pressing. Structural and physical properties, covering also the low temperature range, were studied and compared with the recently investigated impact of nano Ta0.8Zr0.2B on p-type skutterudites. ZT was enhanced by 16%.

As for thermoelectric applications good mechanical properties are important, we investigated the influence of Ta0.8Zr0.2B nanoparticles, added to (Mm,Sm)(y)Co4Sb12, on the hardness, elastic moduli and fracture toughness and found an enhancement of all three mechanical properties. It is well known that p-type skutterudites generally have a higher thermal expansion coefficient than their n-type counterpart. We show that dispersed borides in both n-type (Mm,Sm)(y)Co4Sb12 and p-type DD0.7Fe3CoSb12 can level out this discrepancy. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Organisation(en)
Institut für Materialchemie, Fakultätszentrum für Nanostrukturforschung, Physik Funktioneller Materialien
Externe Organisation(en)
Czech Academy of Sciences, Technische Universität Wien
Journal
Acta Materialia
Band
145
Seiten
359-368
Anzahl der Seiten
10
ISSN
1359-6454
DOI
https://doi.org/10.1016/j.actamat.2017.12.001
Publikationsdatum
02-2018
Peer-reviewed
Ja
ÖFOS 2012
Materialchemie, Physikalische Chemie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/nanostructuring-as-a-tool-to-adjust-thermal-expansion-in-high-zt-skutterudites(d136012e-89d4-4262-8558-023219a35592).html