Thermoelectric properties of bismuth-doped magnesium silicide obtained by the self-propagating high-temperature synthesis

• Autorzy: Bucholc Bartosz , Kaszyca Kamil , Śpiewak Piotr , Mars Krzysztof , Kruszewski Mirosław J. , Ciupiński Łukasz , Kowiorski Krystian , Zybała Rafał

Identyfikatory

DOI

10.24425/bpasts.2022.141007

• Języki publikacji: EN

Abstrakty

EN

Doping is one of the possible ways to significantly increase the thermoelectric properties of many different materials. It has been confirmed that by introducing bismuth atoms into Mg sites in the Mg2Si compound, it is possible to increase career concentration and intensify the effect of phonon scattering, which results in remarkable enhancement in the figure of merit (ZT) value. Magnesium silicide has gained scientists’ attention due to its nontoxicity, low density, and inexpensiveness. This paper reports on our latest attempt to employ ultrafast self-propagating high-temperature synthesis (SHS) followed by the spark plasma sintering (SPS) as a synthesis process of doped Mg2Si. Materials with varied bismuth doping were fabricated and then thoroughly analyzed with the laser flash method (LFA), X-ray diffraction (XRD), scanning electron microscopy (SEM) with an integrated energy-dispersive spectrometer (EDS). For density measurement, the Archimedes method was used. The electrical conductivity was measured using a standard four-probe method. The Seebeck coefficient was calculated from measured Seebeck voltage in the sample subjected to a temperature gradient. The structural analyses showed the Mg2Si phase as dominant and Bi2Mg3 located at grain boundaries. Bismuth doping enhanced ZT for every dopant concentration. ZT = 0.44 and ZT=0.38 were obtained for 3wt% and 2wt% at 770 K, respectively.

Słowa kluczowe

EN

thermoelectric materials; magnesium silicide; bismuth doping; SHS; self-propagating high-temperature synthesis; spark plasma sintering

PL

materiały termoelektryczne; krzemek magnezu; doping bizmutem; SHS; samorozwijająca się wysokotemperaturowa synteza; iskrowe spiekanie plazmowe

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2022
• Tom: Vol. 70, nr 3
• Strony: art. no. e141007
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Bucholc Bartosz

• Łukasiewicz Research Network – Institute of Microelectronics and Photonics, Aleja Lotników 32/46, 02-668 Warsaw, Poland

• https://orcid.org/0000-0002-5806-3472

autor

Kaszyca Kamil

• Łukasiewicz Research Network – Institute of Microelectronics and Photonics, Aleja Lotników 32/46, 02-668 Warsaw, Poland

• https://orcid.org/0000-0001-6901-2585

autor

Śpiewak Piotr

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

• https://orcid.org/0000-0002-2704-2994

autor

Mars Krzysztof

• Faculty of Materials Science and Ceramic, AGH University of Science and Technology, Kraków, Al. Mickiewicza 30, 30-059, Poland

• https://orcid.org/0000-0003-3649-7189

autor

Kruszewski Mirosław J.

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

• https://orcid.org/0000-0002-2576-9006

autor

Ciupiński Łukasz

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

• https://orcid.org/0000-0002-4536-3177

autor

Kowiorski Krystian

• Łukasiewicz Research Network – Institute of Microelectronics and Photonics, Aleja Lotników 32/46, 02-668 Warsaw, Poland

• https://orcid.org/0000-0003-3857-3413

autor

Zybała Rafał

• Łukasiewicz Research Network – Institute of Microelectronics and Photonics, Aleja Lotników 32/46, 02-668 Warsaw, Poland
• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

• https://orcid.org/0000-0002-6538-6632

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).