Thermal Expansion of Skutterudites

Autor(en)

Gerda Rogl, Long Zhang, Peter Franz Rogl, Andrij Grytsiv, Matthias Falmbigl, Daniel Rajs, Martin Kriegisch, Herbert Mueller, Ernst Bauer, Johannes Koppensteiner, Wilfried Schranz, Michael Zehetbauer, Z. Henkie, M. Brian Maple

Abstrakt

The current paper gives an overview of the newly obtained thermal expansion coefficients of skutterudites as well as those so far available in literature. Thermal expansion was determined for CoSb3, Pt4Sn4.4Sb7.6, for As- and Ge-based skutterudites as well as for various high-ZT skutterudites (micro- and nanostructured) with didymium (DD) and mischmetal (Mm) as filler atoms in frameworks of (Fe1-xCox)(4)Sb-12 and (Fe1-xNix)(4)Sb-12, and for double and triple-filled skutterudites such as Ca0.07Ba0.23Co3.95Ni0.05Sb12 and Sr0.025Ba0.075Yb0.1Co4Sb12. For low temperatures, a capacitance dilatometer was used (4-300 K), whereas for temperatures 300 <T <750 K, a dynamic mechanical analyzer was employed. For a set of Ge-, P-, and Sb-based skutterudites, lattice parameters of single crystals, measured at three different temperatures, were used to derive the thermal expansion coefficient. The semiclassical model of Mukherjee [Phys. Rev. Lett. 76, 1876 (1996)] has been successfully used to quantitatively describe the thermal expansion coefficient in terms of Einstein and Debye temperatures, which compare well with the corresponding results from specific heat, electrical resistivity, or temperature dependent x-ray measurements.

Organisation(en)

Physik Nanostrukturierter Materialien, Institut für Physikalische Chemie, Physik Funktioneller Materialien

Externe Organisation(en)

Technische Universität Wien, Polish Academy of Sciences (PAS), University of California, San Diego

Journal

Journal of Applied Physics

Band

107

Anzahl der Seiten

10

ISSN

0021-8979

DOI

https://doi.org/10.1063/1.3284088

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

104017 Physikalische Chemie, 210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/4aaecfa2-322b-4f0c-93b4-4bb697f2743e