Microstructure evolution and thermoelectric properties of Te-poor and Te-rich (Bi,Sb)(2)Te-3 prepared via solidification

Femi, Olu Emmanuel and Ravishankar, N and Chattopadhyay, K (2016) Microstructure evolution and thermoelectric properties of Te-poor and Te-rich (Bi,Sb)(2)Te-3 prepared via solidification. In: JOURNAL OF MATERIALS SCIENCE, 51 (15). pp. 7254-7265.

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Abstract

This paper explores in detail, the microstructures and thermoelectric properties of Te-rich and Te-poor (Bi,Sb)(2)Te-3 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)(2)Te-3 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)(2)Te-3 dendritic cells. The presence of Te imparts an n-type behavior to the composite while the (Bi, Sb)(2)Te-3 with a small amount of (Bi, Sb) Te exhibits p-type properties. A maximum ZT value of approximate to 0.4 at 425 K was achieved, opening up the possibility of using these alloys for thermoelectric device applications.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS SCIENCE
Publisher:	SPRINGER
Additional Information:	Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Jun 2016 04:59
Last Modified:	22 Jun 2016 04:59
URI:	http://eprints.iisc.ac.in/id/eprint/54032

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