Fabrication and Spark Plasma Sintering of Nanostructured Bismuth Telluride (Bi2Te3)
2012 (English)In: 9Th European Conference On Thermoelectrics (ECT2011), American Institute of Physics (AIP), 2012, 115-118 p.Conference paper (Refereed)
Thermoelectric (TE) devices can harvest residual low-grade waste heat energy. Bismuth telluride (Bi2Te3) and its alloys are mostly used TE materials in the bulk form for making TE modules. We report a simple, fast and very high yield synthetic process for the bulk Bi2Te3 nanopowders with hexagonal plate like morphology. Spark plasma sintering (SPS) process has been optimized in order to preserve nanostructure while achieving a high compaction density of the pellets. Electron microscopy analysis was used to determine the effect of SPS parameters during compaction on the grain growth. Optimal conditions for the fabricated nanopowder was determined as 673 K, 70 MPa pressure with no holding time, which resulted in average lateral grain size in the range of 165-190 nm for a compact density of 98%. About 50% reduction of thermal conductivity was observed as compared to its bulk counterparts, revealing the feasibility of suggested route in the preservation of nanostructure and enhanced phonon scattering.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2012. 115-118 p.
, AIP Conference Proceedings, ISSN 0094-243X ; 1449
Bismuth Telluride (Bi2Te3), Bulk Nanostructured, Thermoelectric (TE) Materials
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-117972DOI: 10.1063/1.4731510ISI: 000313173100027ScopusID: 2-s2.0-84872947600ISBN: 978-0-7354-1048-0OAI: oai:DiVA.org:kth-117972DiVA: diva2:604051
9th European Conference on Thermoelectrics (ECT), SEP 28-30, 2011, Thessaloniki, Greece
QC 201302072013-02-072013-02-072013-02-07Bibliographically approved