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  Enhanced thermoelectric properties of the Zintl phase BaGa2Sb2 via doping with Na or K

Aydemir, U., Zevalkink, A., Ormeci, A., Bux, S., & Snyder, G. J. (2016). Enhanced thermoelectric properties of the Zintl phase BaGa2Sb2 via doping with Na or K. Journal of Materials Chemistry A, 4(5), 1867-1875. doi:10.1039/c5ta07612a.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-BC2A-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6688-3
Genre: Journal Article

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 Creators:
Aydemir, Umut1, Author
Zevalkink, Alex2, Author              
Ormeci, Alim2, Author              
Bux, Sabah1, Author
Snyder, G. Jeffrey1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              

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 Abstract: Na- or K-doped samples of Ba1-x(Na, K)(x)Ga2Sb2 were prepared by ball-milling followed by hot-pressing. The topological analysis of the electron density of BaGa2Sb2 implies a polar covalent nature of the Sb-Ga bonds in which the Sb atoms receive the electrons transferred from Ba rather than the Ga atoms. Successful doping of BaGa2Sb2 with Na or K was confirmed with combined microprobe and X-ray diffraction analysis. Alkali metal doping of BaGa2Sb2 increased the p-type charge carrier concentration to almost the predicted optimum values (similar to 10(20) h(+) cm(-3)) needed to achieve high thermoelectric performance. With increasing alkali metal concentration, electronic transport was shifted from non-degenerate semiconducting behaviour observed for BaGa2Sb2 to degenerate one for Na- or K-doped compounds. Overall, the thermoelectric figure of merit, zT, values reached up to similar to 0.65 at 750 K, considerably higher than the undoped sample (zT similar to 0.1 at 600 K), and a slight improvement relative to previously reported Zn-doped samples (similar to 0.6 at 800 K).

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Language(s): eng - English
 Dates: 2016-01-232016-01-23
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000368839200038
DOI: 10.1039/c5ta07612a
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 4 (5) Sequence Number: - Start / End Page: 1867 - 1875 Identifier: ISSN: 2050-7488
CoNE: /journals/resource/2050-7488