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Evaluation of the Structure and Transport Properties of Nanostructured Antimony Telluride (Sb2Te3)
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.ORCID iD: 0000-0001-5678-5298
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2014 (English)In: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 43, no 6, 1927-1932 p.Article in journal (Refereed) Published
Abstract [en]

Antimony telluride, (Sb2Te3), and its doped derivatives are considered to be among the best p-type thermoelectric (TE) materials for room temperature (300-400 K) applications. However, it is still desirable to develop rapid and economical routes for large-scale synthesis of Sb2Te3 nanostructures. We report herein a high yield, simple and easily scalable synthetic method for polycrystalline Sb2Te3 nanostructures. Prepared samples were compacted into dense pellets by use of spark plasma sintering. The products were characterized by x-ray diffraction and scanning electron microscopy. To investigate the anisotropic behavior of Sb2Te3 TE transport property measurements were performed along and perpendicular to the direction of compaction. Thermal conductivity, electrical conductivity, and Seebeck coefficient measurement over the temperature range 350-525 K showed that the anisotropy of the material had a large effect on TE performance.

Place, publisher, year, edition, pages
2014. Vol. 43, no 6, 1927-1932 p.
Keyword [en]
Antimony telluride (Sb2Te3), thermoelectrics, synthesis, anisotropy
National Category
Other Materials Engineering
URN: urn:nbn:se:kth:diva-147732DOI: 10.1007/s11664-013-2911-6ISI: 000336372400067ScopusID: 2-s2.0-84901920224OAI: diva2:732819

QC 20140707

Available from: 2014-07-07 Created: 2014-07-03 Last updated: 2014-09-18Bibliographically approved
In thesis
1. Nano-EngineeredThermoelectric Materials for Waste Heat Recovery
Open this publication in new window or tab >>Nano-EngineeredThermoelectric Materials for Waste Heat Recovery
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Energy crisis and thermal management related issues have been highlighted in the modern century due to escalating demands for energy consumption and global warming from fossil fuels. Sustainable and alternative energy sources are an ever growing global concern. Thermoelectric (TE) materials have gained significant interest, due to effective solid-state energy conversion from waste heat to useful electrical energy and vice versa.   Clean, noise-free, and environment-friendly operation of TE devices has triggered great attention in viable technologies including automotive, military equipment, aerospace, and industries to scavenge waste heat into power. To date, conventional TE materials have shown limited energy conversion efficiency, i.e. TE Figure of Merit (ZT). However, the concept of nanostructuring and development of novel TE materials have opened excellent avenues to improve significantly the ZT values. Nano-engineered bulk TE materials allow effective phonon scattering at the high density of grain boundaries, which offer a way of lowering the thermal conductivity. 

Large-scale synthesis of TE nanomaterials is a challenge for the TE industry because of expensive fabrication processes involved. This thesis reports several nano-engineering approaches for fabricating large quantities of bulk nanostructured TE materials. We have developed bottom-up chemical synthesis routes, as well as top-down mechanical alloying methodologies, to produce highly pure, homogenous and highly crystalline TE nanomaterials. State of the art chalcogenide, iron antimonide, and silicide based TE materials have been investigated in this thesis. Chalcogenide are the best candidates for TE devices operating at temperature range up to 450 K.  Iron antimonide (FeSb2) have shown attractive performance below room temperature. Earth abundant and environment friendly, silicide based materials have better ZT performance in the range of 600-900 K.  Spark plasma sintering (SPS) was utilized to preserve the nanostructuring and to achieve the highest compaction density. Comprehensive physiochemical characterizations were performed on as-prepared and SPS compacted samples. Detailed TE evaluation of the fabricated materials showed significant improvement in ZT for all categories of TE materials.

Place, publisher, year, edition, pages
Stockholm 2014: KTH Royal Institute of Technology, 2014. xi, 52 p.
TRITA-ICT/MAP AVH, ISSN 1653-7610 ; 2014:12
National Category
Materials Chemistry
urn:nbn:se:kth:diva-151363 (URN)978-91-7595-210-9 (ISBN)
Public defence
2014-10-03, SAl B, Electrum 229, Isafajordsgatan 22, Kista, 14:00 (English)
Swedish Energy Agency, 36656-1EU, FP7, Seventh Framework Programme, 263167Swedish Foundation for Strategic Research , EM11-0002EU, FP7, Seventh Framework Programme, 228882

QC 20140918

Available from: 2014-09-18 Created: 2014-09-18 Last updated: 2014-09-18Bibliographically approved

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Saleemi, MohsinToprak, MuhammetMuhammed, Mamoun
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