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.

Identyfikatory

DOI

10.24425/amm.2019.127582

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

ball milling; milling time; microstructure; thermoelectric properties; ZT

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2019
• Tom: Vol. 64, iss. 2
• Strony: 585--590
• Opis fizyczny: Bibliogr. 26 poz., fot., rys., tab., wzory

Twórcy

autor

Sharief P.

• Kongju National University, Division of Advanced Materials Engineering, 1223-2, Seobuk-gu, Cheonan-si, Chungnam, 331-717, South Korea

autor

Madavali B.

• Kongju National University, Division of Advanced Materials Engineering, 1223-2, Seobuk-gu, Cheonan-si, Chungnam, 331-717, South Korea

autor

Koo J. M.

• Kongju National University, Division of Advanced Materials Engineering, 1223-2, Seobuk-gu, Cheonan-si, Chungnam, 331-717, South Korea

autor

Kim H. J.

• Kongju National University, Division of Ceramic Design, Gongju-si, South Korea

autor

Hong S.

• Kongju National University, Division of Mechanical and Automotive Engineering, Cheonan, South Korea

autor

Hong S.-J.

• Kongju National University, Division of Advanced Materials Engineering, 1223-2, Seobuk-gu, Cheonan-si, Chungnam, 331-717, South Korea

Bibliografia

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Uwagi

EN

1. This work was supported by the research grant of the Kongju National University in 2018.

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).