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Optimized thermoelectric properties of Mo_3Sb_(7-x)Te_x with significant phonon scattering by electrons

Shi, Xiaoya and Pei, Yanzhong and Snyder, G. Jeffrey and Chen, Lidong (2011) Optimized thermoelectric properties of Mo_3Sb_(7-x)Te_x with significant phonon scattering by electrons. Energy and Environmental Science, 4 (10). pp. 4086-4095. ISSN 1754-5692. https://resolver.caltech.edu/CaltechAUTHORS:20111108-075927614

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Abstract

Heavily doped compounds Mo_3Sb_(7−x)Te_x (x = 0, 1.0, 1.4, 1.8) were synthesized by solid state reaction and sintered by spark plasma sintering. Both X-ray diffraction and electron probe microanalysis indicated the maximum solubility of Te was around x = 1.8. The trends in the electrical transport properties can generally be understood using a single parabolic band model, which predicts that the extremely high carrier concentration of Mo_3Sb_7 (~10^(22) cm^(−3)) can be reduced to a nearly optimized level (~2 × 10^(21) cm^(−3)) for thermoelectric figure of merit (zT) by Te-substitution with x = 1.8. The increased lattice thermal conductivity by Te-doping was found to be due to the decreased Umklapp and electron–phonon scattering, according to a Debye model fitting. The thermoelectric figure of merit (zT) monotonously increased with increasing temperature and reached its highest value of about 0.51 at 850 K for the sample with x = 1.8, making these materials competitive with the state-of-the-art thermoelectric SiGe alloys. Evidence of significant electron–phonon scattering is found in the thermal conductivity.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c1ee01406dDOIArticle
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2011 Royal Society of Chemistry. Received 03 Apr 2011, Accepted 07 Jul 2011. First published on the web 17 Aug 2011. This work was partially supported by The Program of Shanghai Subject Chief Scientist (09XD1404400) and The National High Technology Research and Development Program of China (2009AA03Z210).
Funders:
Funding AgencyGrant Number
Program of Shanghai Subject Chief Scientist09XD1404400
National High Technology Research and Development program of China2009AA03Z210
Issue or Number:10
Record Number:CaltechAUTHORS:20111108-075927614
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20111108-075927614
Official Citation:Optimized thermoelectric properties of Mo3Sb7−xTex with significant phonon scattering by electrons Xiaoya Shi, Yanzhong Pei, G. Jeffrey Snyder and Lidong Chen Energy Environ. Sci., 2011, 4, 4086-4095 DOI: 10.1039/C1EE01406D
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27665
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:08 Nov 2011 16:56
Last Modified:03 Oct 2019 03:25

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