skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Analysis and Implications of Structural Complexity in Low Lattice Thermal Conductivity High Thermoelectric Performance PbTe–PbSnS 2 Composites

Abstract

The high-performance PbTe-SnTe-PbS-thermoelectric system forms a completely new composite PbTe PbSnS2 with high n-type figure of merit. Electron diffraction and high-resolution electron microscopy characterization of the thermoelectric composite PbTe + 25% PbSnS2 reveals that the system is nanostructured, with PbSnS(2)nanocrystals in the range Of 80 to 500 nm in size. In most of the cases, they are endotaxially grown within the PbTe matrix. Three independent crystal superstructures were observed for the PbSnS2 inclusions, originating from the same parent SnS-type structure. The presence of the parent structure is not excluded. Modified structural models for two of the superstructures observed in the PbSnS2 precipitates are proposed: Often, more than one of the structural phases am observed In the same nanocrystal, providing one extra phonon scattering factor in the system. Evidence was also found for the growth process of the nanocrystals, starting from PbS and followed by gradual dissolving of SnS. Our findings suggest that this nanostructured thermoelectric composite exhibits unique structural complexity, which Contributes to the low lattice thermal :conductivity reported for these nanocomposite materials.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1352613
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry of Materials; Journal Volume: 28; Journal Issue: 11
Country of Publication:
United States
Language:
English

Citation Formats

Ioannidou, Chrysoula, Lioutas, Christos B., Frangis, Nikolaos, Girard, Steven N., and Kanatzidis, Mercouri G. Analysis and Implications of Structural Complexity in Low Lattice Thermal Conductivity High Thermoelectric Performance PbTe–PbSnS 2 Composites. United States: N. p., 2016. Web. doi:10.1021/acs.chemmater.6B00710.
Ioannidou, Chrysoula, Lioutas, Christos B., Frangis, Nikolaos, Girard, Steven N., & Kanatzidis, Mercouri G. Analysis and Implications of Structural Complexity in Low Lattice Thermal Conductivity High Thermoelectric Performance PbTe–PbSnS 2 Composites. United States. doi:10.1021/acs.chemmater.6B00710.
Ioannidou, Chrysoula, Lioutas, Christos B., Frangis, Nikolaos, Girard, Steven N., and Kanatzidis, Mercouri G. Tue . "Analysis and Implications of Structural Complexity in Low Lattice Thermal Conductivity High Thermoelectric Performance PbTe–PbSnS 2 Composites". United States. doi:10.1021/acs.chemmater.6B00710.
@article{osti_1352613,
title = {Analysis and Implications of Structural Complexity in Low Lattice Thermal Conductivity High Thermoelectric Performance PbTe–PbSnS 2 Composites},
author = {Ioannidou, Chrysoula and Lioutas, Christos B. and Frangis, Nikolaos and Girard, Steven N. and Kanatzidis, Mercouri G.},
abstractNote = {The high-performance PbTe-SnTe-PbS-thermoelectric system forms a completely new composite PbTe PbSnS2 with high n-type figure of merit. Electron diffraction and high-resolution electron microscopy characterization of the thermoelectric composite PbTe + 25% PbSnS2 reveals that the system is nanostructured, with PbSnS(2)nanocrystals in the range Of 80 to 500 nm in size. In most of the cases, they are endotaxially grown within the PbTe matrix. Three independent crystal superstructures were observed for the PbSnS2 inclusions, originating from the same parent SnS-type structure. The presence of the parent structure is not excluded. Modified structural models for two of the superstructures observed in the PbSnS2 precipitates are proposed: Often, more than one of the structural phases am observed In the same nanocrystal, providing one extra phonon scattering factor in the system. Evidence was also found for the growth process of the nanocrystals, starting from PbS and followed by gradual dissolving of SnS. Our findings suggest that this nanostructured thermoelectric composite exhibits unique structural complexity, which Contributes to the low lattice thermal :conductivity reported for these nanocomposite materials.},
doi = {10.1021/acs.chemmater.6B00710},
journal = {Chemistry of Materials},
number = 11,
volume = 28,
place = {United States},
year = {Tue Jun 14 00:00:00 EDT 2016},
month = {Tue Jun 14 00:00:00 EDT 2016}
}