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Preparation of nano-sized Bi2Te3 thermoelectric material powders by cryogenic grinding
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2012 (English)In: Progress in Natural Science, ISSN 1002-0071, E-ISSN 1745-5391, Vol. 22, no 3, 201-206 p.Article in journal (Refereed) Published
Abstract [en]

A novel method for rapid preparation of Bi2Te3 nano-sized powders with an average particle size of about 7nm was developed. A starting powder mixture consisting of Bi2Te3 coarse particles of similar to 5mm was ground using cryogenic grinding in the liquid nitrogen. For comparison, the conventional high-energy ball milling was used to prepare the Bi2Te3 nano-sized powders. Sintering properties of as-prepared powders was investigated by spark plasma sintering (SPS). The effects of the preparation procedure on the crystallinity, morphology and structure were examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that Bi2Te3 was not transformed into a non-equilibrium amorphous phase or decomposed during the cryogenic grinding process, and as-prepared nano-powders possessed excellent sinterability. This technique might also be applicable to other thermoelectric materials.

Place, publisher, year, edition, pages
2012. Vol. 22, no 3, 201-206 p.
Keyword [en]
Thermoelectric (TE) material, Cryogenic grinding, Bi2Te3, Nanoparticles, Two-step breaking model
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-79910DOI: 10.1016/j.pnsc.2012.04.006ISI: 000305964200004OAI: oai:DiVA.org:su-79910DiVA: diva2:551710
Note

AuthorCount:6;

Available from: 2012-09-12 Created: 2012-09-11 Last updated: 2017-12-07Bibliographically approved

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