Microstructure evolution and thermoelectric properties of Te-poor and Te-rich (Bi,Sb)2Te3 prepared via solidification

Femi, Olu Emmanuel ; Ravishankar, N. ; Chattopadhyay, K. (2016) Microstructure evolution and thermoelectric properties of Te-poor and Te-rich (Bi,Sb)2Te3 prepared via solidification Journal of Materials Science, 51 (15). pp. 7254-7265. ISSN 0022-2461

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Official URL: http://doi.org/10.1007/s10853-016-0008-3

Related URL: http://dx.doi.org/10.1007/s10853-016-0008-3

Abstract

This paper explores in detail, the microstructures and thermoelectric properties of Te-rich and Te-poor (Bi,Sb)2Te3 alloys. We show that tuning the composition of ternary Bi–Sb–Te type alloys allows us to synthesize a range of microstructures containing a primary solid solution of (Bi,Sb)2Te3 with varying amounts of Te solid solution or a (Bi,Sb)Te compound. Te exists as a constituent of the multilayer domain while (Bi,Sb)Te appears in the thin intercellular regions of the (Bi,Sb)2Te3 dendritic cells. The presence of Te imparts an n-type behavior to the composite while the (Bi,Sb)2Te3 with a small amount of (Bi,Sb)Te exhibits p-type properties. A maximum ZT value of ≈0.4 at 425 K was achieved, opening up the possibility of using these alloys for thermoelectric device applications.

Item Type:Article
Source:Copyright of this article belongs to Springer Nature Switzerland AG
Keywords:Thermoelectric Property;PbTe;Bi2Te3;Seebeck Coefficient;Minority Carrier
ID Code:135265
Deposited On:20 Jan 2023 10:04
Last Modified:20 Jan 2023 10:04

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