Mechanical properties of filled antimonide skutterudites

Zhang, L. and Rogl, G. and Grytsiv, A. and Puchegger, S. and Koppensteiner, J. and Spieckermann, F. and Kabelka, H. and Reinecker, M. and Rogl, P. and Schranz, W. and Zehetbauer, M. and Carpenter, M. A. (2010) Mechanical properties of filled antimonide skutterudites. Materials Science and Engineering: B, 170 (1-3). pp. 26-31. ISSN 0921-5107 DOI 10.1016/j.mseb.2010.02.022

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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 not, vert, similar250 nm) illustrate an obvious improvement of elastic properties in relation to those hot pressed from hand milled powders (grain size not, vert, similar50 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.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA61;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Materials Science and Engineering: B
Volume: 170
Page Range: pp. 26-31
Identification Number: 10.1016/j.mseb.2010.02.022
Depositing User: Sarah Humbert
Date Deposited: 09 Sep 2010 14:20
Last Modified: 23 Jul 2013 10:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/1931

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