Meena, Dilip Kumar and Bose, Rapaka S C 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. Applied Physics A-Materials Science & Processing, 128 (6). Art No-528. ISSN 0947-8396

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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 similar to 0.06 at 423 K due to higher defect density. This study attempts to explain the different zT values observed for different quenching mediums.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	14 Sep 2023 10:37
Last Modified:	14 Sep 2023 10:37
URI:	http://cgcri.csircentral.net/id/eprint/5480

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