Publikationen

New p- and n-type skutterudites with ZT > 1 and nearly identical thermal expansion and mechanical properties

Autor(en)
Gerda Rogl, Andrij Grytsiv, Esmaeil Royanian, P. Heinrich, Ernst Bauer, Peter Franz Rogl, Michael Zehetbauer, Stephan Puchegger, Marius Reinecker, Wilfried Schranz
Abstrakt

Using thermoelectricity to directly convert (waste) heat energy into useful electricity faces a number of challenges. Not only are optimised thermal and electrical transport properties required resulting in a high figure of merit ZT and a high thermal electric conversion efficiency eta over a wide temperature range, thermoelectric (TE) materials must have sufficient mechanical integrity to survive continuous heating cooling cycles. Thermal expansion of the material as well as the mechanical properties play an important role, i.e. their values should be as similar as possible for p- and n-type alloys to avoid stresses when used in a TE device. In this paper multiple filled p- and n-type skutterudites (Ba,Sr,DD,Yb)(y)(Fe1-xNix)(4)Sb-12 with a ZT > 1 and eta approximate to 13% are presented, for the first time showing, in contrast to hitherto investigated skutterudites, nearly identical thermal expansion coefficients and elastic moduli. The ZT values of these skutterudites could be further enhanced by more than 20% after severe plastic deformation via high-pressure torsion.

Organisation(en)
Institut für Physikalische Chemie, Physik Nanostrukturierter Materialien, Fakultätszentrum für Nanostrukturforschung, Physik Funktioneller Materialien
Externe Organisation(en)
Technische Universität Wien
Journal
Acta Materialia
Band
61
Seiten
4066-4079
Anzahl der Seiten
14
ISSN
1359-6454
DOI
https://doi.org/10.1016/j.actamat.2013.03.031
Publikationsdatum
2013
Peer-reviewed
Ja
ÖFOS 2012
Physikalische Chemie, Nanotechnologie, Materialchemie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/new-p-and-ntype-skutterudites-with-zt--1-and-nearly-identical-thermal-expansion-and-mechanical-properties(2a5b9c57-5df8-4b26-b61c-71126ce18ca4).html