Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 212, Issue 10, Pages 2191-2195Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201532045
Keywords
hardness; mechanical properties; nanoindentation; thermoelectric materials
Funding
- DOE EERE [DE-EE0004840]
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In order to fabricate durable and efficient thermoelectric generators (TEG) for applications like automobile waste heat recovery, where thermal stress is a major concern, one needs to assess the mechanical performance of the TE materials. This work reports the hardness and elastic modulus of the moderate temperature range (200-1000 degrees C) TE materials, including half-Heusler, skutterudites, bismuth telluride, silicon germanium alloys, and lead selenide, using nanoindentation and atomic force microscopy (AFM). The p-type half-Heusler exhibits considerably higher hardness and modulus values, and lower brittleness as compared with other materials, which may be indicative of its more robust mechanical performance.
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