Reduction of Thermal Conductivity through the Dispersion of TiC Nanoparticles into a p-Type Bi0.5Sb1.5Te3 Alloy by Ball Milling and Spark Plasma Sintering

• Autorzy: Nagarjuna Cheenepalli , Madavali Babu , Lee Myeong-Won , Yoon Suk-Min , Hong Soon-Jik

Identyfikatory

DOI

10.24425/amm.2019.127577

• Języki publikacji: EN

Abstrakty

EN

The dispersion of nanoparticles in the host matrix is a novel approach to enhance the thermoelectric performance. In this work, we incorporate the TiC (x = 0, 1 and 2 wt.%) nanoparticles into a p-type Bi_0.5Sb_1.5Te₃ matrix, and their effects on microstructure and thermoelectric properties were systematically investigated. The existence of TiC contents in a base matrix was confirmed by energy dispersive X-ray spectroscopy analysis. The grain size decreases with increasing the addition of TiC content due to grain boundary hardening where the dispersed nanoparticles acted as pinning points in the entire matrix. The electrical conductivity significantly decreased and the Seebeck coefficient was slightly enhanced, which attributes to the decrease in carrier concentration by the addition of TiC content. Meanwhile, the lowest thermal conductivity of 0.97 W/mK for the 2 wt.% TiC nanocomposite sample, which is ~16% lower than 0 wt.% TiC sample. The maximum figure of merit of 0.90 was obtained at 350 K for the 0 wt.% TiC sample due to high electrical conductivity. Moreover, the Vickers hardness was improved with increase the addition of TiC contents.

Słowa kluczowe

EN

Bi0.5Sb1.5Te3 alloys; nanocomposites; ball milling; spark plasma sintering; thermoelectric properties

• 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: 551--557
• Opis fizyczny: Bibliogr. 22 poz., fot., rys., tab., wzory

Twórcy

autor

Nagarjuna Cheenepalli

• Kongju National University, Division of Advanced Materials Engineering, Cheonan-si 31080, Republic of Korea

autor

Madavali Babu

• Kongju National University, Division of Advanced Materials Engineering, Cheonan-si 31080, Republic of Korea

autor

Lee Myeong-Won

• Kongju National University, Division of Advanced Materials Engineering, Cheonan-si 31080, Republic of Korea

autor

Yoon Suk-Min

• Kongju National University, Division of Advanced Materials Engineering, Cheonan-si 31080, Republic of Korea

autor

Hong Soon-Jik

• Kongju National University, Division of Advanced Materials Engineering, Cheonan-si 31080, Republic of Korea

Bibliografia

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Uwagi

EN

1. This work was supported by the Industrial Strategic Technology Development Program-Development of high efficient thermoelectric module with figure of merit (Z) 3.4 (X10-3) by using 1.0 kg/batch scale productible polycrystalline thermoelectric material with average figure of merit (ZT) 1.4 and over (10063286) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

PL

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