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Interdiffusion of Bi and Sb in Superlattices Built from Blocks of Bi2Te3, Sb2Te3 and TiTe2

Published online by Cambridge University Press:  31 January 2011

Clay D. Mortensen  and
David Johnson
Clay D. Mortensen
Affiliation:
[email protected], University of Oregon, Department of Chemistry and Materials Science Institute, Eugene, Oregon, United States
David Johnson
Affiliation:
[email protected], University of Oregon, 1253 University of Oregon, Eugene, Oregon, 97403-1253, United States
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Abstract

The reaction kinetics of [(Ti-Te)]x[(Sb-Te)]y, [(Bi-Te)]x[(Sb-Te)]y, [(Ti-Te)]w[(Bi-Te)]x and [(Ti-Te)]w[(Bi-Te)]x[(Ti-Te)]y[(Sb-Te)]z precursors as a function of annealing temperature and time was probed using x-ray diffraction techniques to define the parameters required to form superlattice structures. [(TiTe2)1.36]x[Sb2Te3]y and [(TiTe2)1.36]x[Bi2Te3]y superlattices were observed to form while [(Bi-Te)]x[(Sb-Te)]y precursors yielded only Bi2-xSbxTe3 alloys. This behavior was correlated with the immiscibility/miscibility of the constituents of the targeted superlattices. For the three component system, Bi and Sb were observed to interdiffuse through the Ti-Te layer over the range of Ti-Te thicknesses explored, resulting in formation of (BixSb1-x)2Te3 alloys within the superlattice structure. When the Bi2Te3 and Sb2Te3 thicknesses were equal, symmetric [{(TiTe2)}1.36]w[(Bi0.5Sb0.5)2Te3]y superlattices were formed.

Keywords

thermoelectricthin filmchemical synthesis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1166: Symposium N – Materials and Devices for Thermal-to-Electric Energy Conversion , 2009 , 1166-N02-02
Copyright
Copyright © Materials Research Society 2009

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