Autor: Koo, J.-M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of Ga2O3 Nanoparticles Dispersion on Microstructure and Thermoelectric Properties of p-Type BiSbTe Based Alloys
Autorzy:: Kim, E.-B.
Koo, J.-M.
Hong, S.-J.
Powiązania:: https://bibliotekanauki.pl/articles/351366.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thermoelectric properties
Bi0.5Sb1.5Te3 alloys
Seebeck coefficient
mechanical alloying
spark plasma sintering
Opis:: In this study, p-type Bi_0.5Sb_1.5Te₃ based nanocomposites with addition of different weight percentages of Ga₂O₃ nanoparticles are fabricated by mechanical milling and spark plasma sintering. The fracture surfaces of all Bi_0.5Sb_1.5Te₃ nanocomposites exhibited similar grain distribution on the entire fracture surface. The Vickers hardness is improved for the Bi_0.5Sb_1.5Te₃ nanocomposites with 6 wt% added Ga₂O₃ due to exhibiting fine microstructure, and dispersion strengthening mechanism. The Seebeck coefficient of Bi_0.5Sb_1.5Te₃ nanocomposites are significantly improved owing to the decrease in carrier concentration. The electrical conductivity is decreased rapidly upon the addition of Ga₂O₃ nanoparticle due to increasing carrier scattering at newly formed interfaces. The peak power factor of 3.24 W/mK² is achieved for the base Bi_0.5Sb_1.5Te₃ sintered bulk. TheBi_0.5Sb_1.5Te₃ nanocomposites show low power factor than base sample due to low electrical conductivity.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2B; 993-997
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of Milling Time Parameter on the Microstructure and the Thermoelectric Properties of n-Type Bi2Te2.7Se0.3 Alloys
Autorzy:: Sharief, P.
Madavali, B.
Koo, J. M.
Kim, H. J.
Hong, S.
Hong, S.-J.
Powiązania:: https://bibliotekanauki.pl/articles/354418.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ball milling
milling time
microstructure
thermoelectric properties
ZT
Opis:: Nanostructured thermoelectric materials receiving great attention for its high thermoelectric performance. In this research, nanostructured n-type Bi₂ Te_2.7 Se_0.3 alloys have prepared using high energy ball milling and followed by spark plasma sintering. Also, we have varied ball milling time to investigate milling time parameter on the thermoelectric properties of n-type Bi₂ Te_2.7 Se_0.3 powder. The powders were discrete at 10 min milling and later particles tend to agglomerate at higher milling time due to cold welding. The bulk fracture surface display multi-scale grains where small grains intersperse in between large grains. The maximum Seebeck coefficient value was obtained at 20-min milling time due to their lower carrier density. The κ values were decreased with increasing milling time due to the decreasing trend observed in their κ_L values. The highest ZT of 0.7 at 350 K was observed for 30-min milling time which was ascribed to its lower thermal conductivity. The Vickers hardness values also greatly improved due to their fine microstructure.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 2; 585-590
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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