Publications
Mechanical properties of filled antimonide skutterudites
- Author(s)
- Long Zhang, Gerda Rogl, Andrij Grytsiv, Stephan Puchegger, Johannes Koppensteiner, Florian Spieckermann, Heinz Kabelka, Marius Reinecker, Peter Franz Rogl, Wilfried Schranz, Michael Zehetbauer, Michael Allan Carpenter
- Abstract
Time-of-flight and resonant ultrasound spectroscopy techniques were employed for elastic moduli measurements on a set of various Fe4Sb12- and Co4Sb12-based skutterudites filled by mischmetal, didymium, or alkaline earths (Ca, Sr, Ba). A weak temperature influence on the longitudinal modulus C11 indicates weak degradation of elastic properties within the thermoelectric working temperature range. Elastic moduli for Co4Sb12-based skutterudites are only slightly higher than for Fe4Sb12-based skutterudites, and the influence of various filler atoms or filling fractions on the elastic moduli is even smaller. Ball milled and hot pressed samples (grain size ~250 nm) illustrate an obvious improvement of elastic properties in relation to those hot pressed from hand milled powders (grain size ~50 µm). Debye temperatures calculated from sound velocity measurements are comparable to the values obtained from the parameters fitted to thermal expansion, which indicate that Co4Sb12-based skutterudites having slightly higher values than Fe4Sb12-based skutterudites. Vickers hardness is increased by Co or Ni substitution and demonstrates a linear dependence on density, Young's modulus, and shear modulus.
- Organisation(s)
- Physics of Nanostructured Materials, Department of Physical Chemistry, Dynamics of Condensed Systems, Physics of Functional Materials
- External organisation(s)
- University of Cambridge
- Journal
- Materials Science and Engineering B-Advanced Functional Solid-State Materials
- Volume
- 170
- Pages
- 26-31
- No. of pages
- 6
- ISSN
- 0921-5107
- DOI
- https://doi.org/10.1016/j.mseb.2010.02.022
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104017 Physical chemistry, 1030 Physics, Astronomy
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/mechanical-properties-of-filled-antimonide-skutterudites(afd1f85a-b255-4c5d-8839-0410aca6c70d).html