Mechanical properties of filled antimonide skutterudites

Autor(en)

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

Abstrakt

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(en)

Physik Nanostrukturierter Materialien, Institut für Physikalische Chemie, Dynamik Kondensierter Systeme, Physik Funktioneller Materialien

Externe Organisation(en)

University of Cambridge

Journal

Materials Science and Engineering B-Advanced Functional Solid-State Materials

Band

170

Seiten

26-31

Anzahl der Seiten

6

ISSN

0921-5107

DOI

https://doi.org/10.1016/j.mseb.2010.02.022

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

104017 Physikalische Chemie, 1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/afd1f85a-b255-4c5d-8839-0410aca6c70d