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  Sodium Substitution in Lead Telluride

Wang, X., Veremchuk, I., Bobnar, M., Burkhardt, U., Zhao, J.-T., & Grin, Y. (2018). Sodium Substitution in Lead Telluride. Chemistry of Materials, 30(4), 1362-1372. doi:10.1021/acs.chemmater.7b05091.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-ED91-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-ED9D-5
Genre: Journal Article

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 Creators:
Wang, Xinke1, Author              
Veremchuk, Igor2, Author              
Bobnar, Matej1, Author              
Burkhardt, Ulrich3, Author              
Zhao, Jing-Tai4, Author
Grin, Yuri5, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              
3Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
4External Organizations, ou_persistent22              
5Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: Sodium is widely used as a substituting element in p-type PbTe-based thermoelectric materials. In this work, two series of polycrystalline samples Pb1-yNayTe1-y/2 (total charge balance) and Pb1-xNaxTe (total charge nonbalance) were examined. Na has limited solubility for both of the series. The MAS Na-23 NMR analysis of Pb1-xNaxTe series (for Pb0.98Na0.02Te sample after spark-plasma sintering, SPS) reveals only one Na signal, corresponding to Na atoms coordinated by six Te atoms, indicating substitution of Pb by Na without defects in the Te sublattice. In the Pb1-yNayTe1-y/2 series, clustering of Na atoms with reduced coordination by Te was observed. Additional heat treatment of these samples leads to the reorganization of the Na clusters in PbTe and their equilibration with the homogenized.,. distribution of Na in the whole volume. The maximum ZT values of 1.4-1.6 at 760 K are established for both Pb1-xNaxTe and Pb1-yNayTe1-y/2 series. Upon long-time annealing at 873 K, reorganization and redistribution of Na atoms lead to the change in carrier concentration and, consequently, the thermoelectric properties for both series.

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Language(s): eng - English
 Dates: 2018-01-292018-01-29
 Publication Status: Published in print
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Title: Chemistry of Materials
  Abbreviation : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 30 (4) Sequence Number: - Start / End Page: 1362 - 1372 Identifier: ISSN: 0897-4756
CoNE: /journals/resource/954925561571