High thermoelectric performance of triple-filled n-type skutterudites (Sr,Ba,Yb)(y)Co4Sb12

Autor(en)

Long Zhang, Andrij Grytsiv, Peter Franz Rogl, Ernst Bauer, Michael Zehetbauer

Abstrakt

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(en)

Physik Nanostrukturierter Materialien, Institut für Physikalische Chemie

Externe Organisation(en)

Technische Universität Wien

Journal

Journal of Physics D: Applied Physics

Band

42

ISSN

0022-3727

DOI

https://doi.org/10.1088/0022-3727/42/22/225405

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/bef7982c-5b3c-409f-9f1f-ca5802d8bdb0