The nanocrystalline thermoelectric compound Bi2Te3 forms by a particle-wise explosive reaction during mechanical alloying

TitleThe nanocrystalline thermoelectric compound Bi2Te3 forms by a particle-wise explosive reaction during mechanical alloying
Publication TypeJournal Article
Year of Publication2011
AuthorsHumphry-Baker, SA, Schuh, CA
JournalScripta Materialia
Volume65
Issue6
Pagination516 - 519
Date Published2011/09//
Abstract

During mechanical alloying to synthesize the nanocrystalline thermoelectric compound Bi2Te3, the reaction from elemental constituents occurs in only 15 min. Using X-ray diffraction and quantitative metallography, the mechanism for this rapid transformation is identified as Te and Bi powders reacting explosively on a particle-by-particle basis. The reaction is apparently ignited by local heat release from milling tool collisions, and sustained by the heat of compound formation only over the scale of individual particles. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.