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