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Infrared Studies of the (1-x) PbTe – (x) PbSnS2 System

Published online by Cambridge University Press:  22 June 2011

Thomas C. Hasapis ,
Steven N. Girard ,
Euripides Hatzikraniotis ,
Konstantinos M. Paraskevopoulos  and
Mercouri G. Kanatzidis
Thomas C. Hasapis
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Steven N. Girard
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, United States
Euripides Hatzikraniotis
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Konstantinos M. Paraskevopoulos
Affiliation:
Physics Department, Aristotle University of Thessaloniki, GR- 54124, Thessaloniki, Greece
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL, United States
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Abstract

In this work we report on the infrared properties of the thermoelectric (1-x)PbTe-xPbSnS2 system with x=0.03, 0.06, 0.11 and 0.33. The results obtained by the analysis of the reflectivity spectra are discussed together with the structural and morphological characteristics obtained by XRD and SEM-EDS measurements. The system was found macroscopically homogeneous for x=0.03 and x=0.06 and phase separated for x=0.11 and x=0.33. The analyzed ~150cm-1 PbS impurity mode demonstrated a composition close to the PbTe0.98S0.02 for the major phase. The incorporation of PbSnS2 causes a reduction in plasma frequency (decrease in carrier frequency concentration) and an increase in carrier mobility.

Keywords

microstructureinfrared (IR) spectroscopythermoelectric
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1325: Symposium E – Energy Harvesting—Recent Advances in Materials, Devices and Applications , 2011 , mrss11-1325-e06-08
Copyright
Copyright © Materials Research Society 2011

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References

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