Impact of melt solidification rate on structural and thermoelectric properties of n-type Bi2Te3 alloy

Meena, DK and Bose, RSC and Vinoth, S and Annapurna, K and Ramesh, K (2022) Impact of melt solidification rate on structural and thermoelectric properties of n-type Bi2Te3 alloy. In: Applied Physics A: Materials Science and Processing, 128 (6).

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Abstract

Alloys based on bismuth telluride (Bi2Te3) form an important class of thermoelectric materials used in Peltier cooling devices and thermoelectric generators. In this work, polycrystalline n-type Bi2Te3 alloy was prepared by a melt-quenching process using different quenching mediums: alkaline ice water, ice water, normal water, liquid nitrogen, and air-cooling. The relation between melt solidification rate and structural and thermoelectric transport properties of Bi2Te3 alloy were studied. The pure phase of Bi2Te3 is confirmed by structural characterizations: XRD and Raman. This study showed that the melt solidification rate has a consequential role in modulating the microstructure and thermoelectric transport properties. The moderate cooling rate of melt solidification showed the highest zT of ~ 0.06 at 423 K due to higher defect density. This study attempts to explain the different zT values observed for different quenching mediums. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

Item Type:	Journal Article
Publication:	Applied Physics A: Materials Science and Processing
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to the Springer Science and Business Media Deutschland GmbH.
Keywords:	Alloys; Bismuth compounds; Cooling; Liquefied gases; Polycrystalline materials; Quenching; Solidification; Thermoelectric equipment; Thermoelectricity; Transport properties, Bi2te3 alloy; Ice water; Melt solidification; Quenching media; Solidification rate; Thermo-Electric materials; Thermoelectric material; Thermoelectric performance; Thermoelectric properties; Thermoelectric transport properties, Microstructure
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	20 Jun 2022 11:36
Last Modified:	20 Jun 2022 11:36
URI:	https://eprints.iisc.ac.in/id/eprint/73602

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