Reduction of Thermal Conductivity Through Complex Microstructure by Dispersion of Carbon Nanofiber in p-Type Bi_0.5Sb_1.5Te₃ Alloys

• Autorzy: Sharief P. , Madavali B. , Sohn Y. , Han J. H. , Song G. , Hong S. J.

Identyfikatory

DOI

10.24425/amm.2021.136384

• Języki publikacji: EN

Abstrakty

EN

The influence of nano dispersion on the thermoelectric properties of Bi₂Te₃ was actively investigating to wide-spread thermoelectric applications. Herein this report, we have systematically controlled the microstructure of Bi_0.5Sb_1.5Te₃ (BST) alloys through the incorporation of carbon nanofiber (CNF), and studied their effect on thermoelectric properties, and mechanical properties. The BST/x-CNF (x-0, 0.05, 0.1, 0.2 wt.%) composites powder was fabricated using high energy ball milling, and subsequently consolidated the powder using spark plasma sintering. The identification of CNF in bulk composites was analyzed in Raman spectroscopy and corresponding CNF peaks were recognized. The BST matrix grain size was greatly reduced with CNF dispersion and consistently decreased along CNF percentage. The electrical conductivity was reduced and Seebeck coefficient varied in small-scale by embedding CNF. The thermal conductivity was progressively diminished, obtained lattice thermal conductivity was lowest compared to bare sample due to induced phonon scattering at interfaces of secondary phases as well as highly dense fine grain boundaries. The peak ZT of 0.95 achieved for 0.1 wt.% dispersed BST/CNF composites. The Vickers hardness value of 101.8 Hv was obtained for the BST/CNF composites.

Słowa kluczowe

EN

bismuth telluride; carbon nano fiber; grain size; Thermal conductivity; 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: 2021
• Tom: Vol. 66, iss. 3
• Strony: 803--808
• Opis fizyczny: Bibliogr. 24 poz., rys., tab., wykr.

Twórcy

autor

Sharief P.

• Kongju National University, Division of Advanced Materials Engineering & Institute for Rare Metals, Cheonan, 331-717, Republic of Korea

autor

Madavali B.

• Kongju National University, Division of Advanced Materials Engineering & Institute for Rare Metals, Cheonan, 331-717, Republic of Korea

autor

Sohn Y.

• Chungnam National University, Department of Materials Science & Engineering, Daejeon, 34134, Republic of Korea

autor

Han J. H.

• Chungnam National University, Department of Materials Science & Engineering, Daejeon, 34134, Republic of Korea

autor

Song G.

• Kongju National University, Division of Advanced Materials Engineering & Institute for Rare Metals, Cheonan, 331-717, Republic of Korea

autor

Hong S. J.

• Kongju National University, Division of Advanced Materials Engineering & Institute for Rare Metals, Cheonan, 331-717, Republic of Korea

Bibliografia

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Uwagi

1. This work was supported by the research grant of the Kongju National University in 2020.

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).