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Title Bismuth Doping in Nanostructured Tetrahedrite: Scalable Synthesis and Thermoelectric Performance
Authors Balaz, P.
Guilmeau, E.
Achimovicova, M.
Balaz, M.
Daneu, N.
Dobrozhan, Oleksandr Anatoliiovych  
Kanuchova, M.
ORCID http://orcid.org/0000-0001-9238-7596
Keywords tetrahedrite
doping
bismuth
high-energy milling
thermoelectricity
Type Article
Date of Issue 2021
URI https://essuir.sumdu.edu.ua/handle/123456789/84730
Publisher MDPI
License Creative Commons Attribution 4.0 International License
Citation Baláž P, Guilmeau E, Achimovičová M, Baláž M, Daneu N, Dobrozhan O, Kaňuchová M. Bismuth Doping in Nanostructured Tetrahedrite: Scalable Synthesis and Thermoelectric Performance. Nanomaterials. 2021; 11(6):1386. https://doi.org/10.3390/nano11061386
Abstract In this study, we demonstrate the feasibility of Bi-doped tetrahedrite Cu12Sb4−xBixS13 (x = 0.02–0.20) synthesis in an industrial eccentric vibratory mill using Cu, Sb, Bi and S elemental precursors. High-energy milling was followed by spark plasma sintering. In all the samples, the prevailing content of tetrahedrite Cu12Sb4S13 (71–87%) and famatinite Cu3SbS4 (13–21%), together with small amounts of skinnerite Cu3SbS3, have been detected. The occurrence of the individual Cu-Sb-S phases and oxidation states of bismuth identified as Bi0 and Bi3+ are correlated. The most prominent effect of the simultaneous milling and doping on the thermoelectric properties is a decrease in the total thermal conductivity (κ) with increasing Bi content, in relation with the increasing amount of famatinite and skinnerite contents. The lowest value of κ was achieved for x = 0.2 (1.1 W m−1 K −1 at 675 K). However, this sample also manifests the lowest electrical conductivity σ, combined with relatively unchanged values for the Seebeck coefficient (S) compared with the un-doped sample. Overall, the lowered electrical performances outweigh the benefits from the decrease in thermal conductivity and the resulting figure-of-merit values illustrate a degradation effect of Bi doping on the thermoelectric properties of tetrahedrite in these synthesis conditions.
Appears in Collections: Наукові видання (ЕлІТ)

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