Reduction of Thermal Conductivity Through Complex Microstructure by D…
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논문명 | Reduction of Thermal Conductivity Through Complex Microstructure by Dispersion of Carbon Nanofiber in p-Type Bi0.5Sb1.5Te3 Alloys |
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저자 | P. Sharief, Madavali, Y. Sohn, J.H. Han, G. Song, S.H. Song, S.J. Hong |
저널명 | Archives of Metallurgy and Materials |
게재년월 | 2021 |
Vol. pp |
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 Bi0.5Sb1.5Te3 (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