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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of Spark Plasma Sintering Temperature on Microstructure and Tthermoelectric Properties of Cu-Doped Bi0.5Sb1.495Te3 Compound
    Autorzy:
    Lee, Chul-Hee
    Dharmaiah, Peyala
    Song, Jun-Woo
    Jeong, Kwang-Yong
    Hong, Soon-Jik
    Powiązania:
    https://bibliotekanauki.pl/articles/353226.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bismuth antimony telluride
    gas atomization
    spark plasma sintering
    microstructure
    thermoelectric materials
    Opis:
    Due to air pollution, global warming and energy shortage demands new clean energy conversion technologies. The conversion of industrial waste heat into useful electricity using thermoelectric (TE) technology is a promising method in recent decades. Still, its applications are limited by the low efficiency of TE materials in the operating range between 400-600 K. In this work, we have fabricated Cu0.005 Bi0.5Sb1.495Te3 powder using a single step gas atomization process followed by spark plasma sintering at different temperatures (623, 673, 723, and 773 K), and their thermoelectric properties were investigated. The variation of sintering temperature showed a significant impact on the grain size. The Seebeck coefficient values at room temperature increased significantly from 127 μVK to 151 μV/K with increasing sintering temperature from 623 K to 723 K due to decreased carrier concentration. The maximum ZT values for the four samples were similar in the range between 1.15 to 1.18 at 450 K, which suggest these materials could be used for power generation in the mid-temperature range (400-600 K).
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1105-1110
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Surfactant Addition on Bi2Te3 Nanostructures Synthesized by Hydrothermal Method
    Autorzy:
    Dharmaiah, P.
    Lee, C. H.
    Madavali, B.
    Hong, S.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351609.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bismuth telluride
    hydrothermal synthesis
    spark plasma sintering
    thermoelectric materials
    X-ray diffraction
    Opis:
    In the present work, we have prepared Bi2Te3 nanostructures with different morphologies such as nano-spherical, nanoplates and nanoflakes obtained using various surfactant additions (EG, PVP, and EDTA) by a hydrothermal method. The shape of the nanoparticles can be controlled by addition of surfactants. The samples were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that the minority BiOCl phase disappears after maintained pH at 10 with EG as surfactant. SEM bulk microstructure reveals that the sample consists of fine and coarse grains. Temperature dependence of thermoelectric properties of the nanostructured bulk sample was investigated in the range of 300-450K. The presence of nanograins in the bulk sample exhibits a reduction of thermal conductivity and less effect on electrical conductivity. As a result, a figure of merit of the sintered bulk sample reached 0.2 at 400 K. A maximum micro Vickers hardness of 102 Hv was obtained for the nanostructured sample, which was higher than the other reported results.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1005-1010
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    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
    Powiązania:
    https://bibliotekanauki.pl/articles/2173670.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric materials
    magnesium silicide
    bismuth doping
    SHS
    self-propagating high-temperature synthesis
    spark plasma sintering
    materiały termoelektryczne
    krzemek magnezu
    doping bizmutem
    samorozwijająca się wysokotemperaturowa synteza
    iskrowe spiekanie plazmowe
    Opis:
    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.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e141007
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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