High thermoelectric performance of triple-filled n-type skutterudites (Sr,Ba,Yb)(y)Co4Sb12
- Author(s)
- Long Zhang, Andrij Grytsiv, Peter Franz Rogl, Ernst Bauer, Michael Zehetbauer
- Abstract
The influences of single, double and triple filling of Yb, Ba and Sr in CoSb3 on thermoelectric performance were evaluated. A significant suppression of lattice thermal conductivity κl is achieved by the increase in the number of filler elements. The highest power factor appears in triple-filled (Ba0.1Yb0.1)0.25(Sr0.1Yb0.1)0.75Co4Sb12, whereas single-filled Ba0.23Co4Sb12 has higher S2/ρ than double-filled (Ba,Yb)0.2Co4Sb12 forming a sequence S2/ρ(triple filling) > S2/ρ(single filling) > S2/ρ(double filling). However, the respective figures of merit follow a sequence ZT(triple filling) > ZT(double filling) > ZT(single filling) proving a strong correlation with κl that appears to be a predominant factor in the efficiency of filled skutterudites. Thus, κ and ZT increase with increasing lattice thermal resistivity (1/κl) and maximum efficiencies may be obtained for 1/κl > 0.2 cm K mW−1.
- Organisation(s)
- Physics of Nanostructured Materials, Department of Physical Chemistry
- External organisation(s)
- Technische Universität Wien
- Journal
- Journal of Physics D: Applied Physics
- Volume
- 42
- ISSN
- 0022-3727
- DOI
- https://doi.org/10.1088/0022-3727/42/22/225405
- Publication date
- 2009
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103023 Polymer physics, 210006 Nanotechnology, 103018 Materials physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/high-thermoelectric-performance-of-triplefilled-ntype-skutterudites-srbaybyco4sb12(bef7982c-5b3c-409f-9f1f-ca5802d8bdb0).html