Improved mechanical properties of thermoelectric (Bi 0.2 Sb 0.8 ) 2 Te 3 by nanostructuring

Temperature-dependent strength of Bi-Sb-Te under uniaxial compression is investigated. Bi-Sb-Te samples were produced by three methods: vertical zone-melting, hot extrusion, and spark plasma sintering (SPS). For zone-melted and extruded samples, the brittle-ductile transition occurs over a temperatu...

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Bibliographic Details
Published in:APL materials 2016-10, Vol.4 (10), p.104807
Main Authors: Lavrentev, M. G., Osvenskii, V. B., Parkhomenko, Yu. N., Pivovarov, G. I., Sorokin, A. I., Bulat, L. P., Kim, H.-S., Witting, I. T., Snyder, G. J., Bublik, V. T., Tabachkova, N. Yu
Format: Article
Language:English
Subjects:
MATERIALS SCIENCE
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Summary:Temperature-dependent strength of Bi-Sb-Te under uniaxial compression is investigated. Bi-Sb-Te samples were produced by three methods: vertical zone-melting, hot extrusion, and spark plasma sintering (SPS). For zone-melted and extruded samples, the brittle-ductile transition occurs over a temperature range of 200-350 °C. In nanostructured samples produced via SPS, the transition is observed in a narrower temperature range of 170-200 °C. At room temperature, the strength of the nanostructured samples is higher than that of zone-melted and extruded samples, but above 300 °C, all samples decrease to roughly the same strength.
ISSN:2166-532X
2166-532X
DOI:10.1063/1.4953173