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Nanostructuring of p- and n-type skutterudites reaching figures of merit of approximately 1.3 and 1.6, respectively

Autor(en)
G. Rogl, A. Grytsiv, P. Rogl, E. Bauer, M. Hochenhofer, R. Anbalagan, R. C. Mallik, E. Schafler
Abstrakt

Thermoelectric (TE) conversion of waste heat into useful electricity demands optimized thermal and electrical transport in the leg material over a wide temperature range. In order to gain a reasonably high figure of merit (ZT) as well as high thermal-electric conversion efficiency, various conditions of the starting material were studied: industrially produced skutterudite powders of p-type DD

y(Fe

1-xCo

x)

4Sb

12 (DD: didymium) and n-type (Mm, Sm)

yCo

4Sb

12 (Mm: mischmetal) were used. After a rather fast reaction-melting technique, the bulk was crushed and sieved with various strainers in order to obtain particles below the respective mesh sizes, followed by ball-milling under three different conditions. The dependence of the TE properties (after hot pressing) on the micro/nanosized particles, grains and crystallites was investigated. Optimized conditions resulted in an increase of ZT for bulk material to current record-high values: from ZT ∼ 1.1 to ZT ∼ 1.3 at 775 K for p-type and from ZT ∼ 1.0 to ZT ∼ 1.6 at 800 K for n-type, resulting in respective efficiencies (300-850 K) of η > 13% and η ∼ 16%.

Organisation(en)
Institut für Physikalische Chemie, Physik Nanostrukturierter Materialien
Externe Organisation(en)
Indian Institute of Science, Treibacher Industrie AG, Technische Universität Wien
Journal
Acta Materialia
Band
76
Seiten
434-448
Anzahl der Seiten
15
ISSN
1359-6454
DOI
https://doi.org/10.1016/j.actamat.2014.05.051
Publikationsdatum
09-2014
Peer-reviewed
Ja
ÖFOS 2012
104017 Physikalische Chemie, 103018 Materialphysik, 103009 Festkörperphysik
Schlagwörter
ASJC Scopus Sachgebiete
Electronic, Optical and Magnetic Materials, Ceramics and Composites, Metals and Alloys, Polymers and Plastics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/551453d7-fe2d-4d9c-a578-c446343f1de6