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Title: Structure of Polycrystalline Thermoelectric Bulk Material AgPb mSbTe 2+m

Abstract

No abstract prepared.

Authors:
 [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
Work for Others (WFO)
OSTI Identifier:
983810
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Microscopy and Microanalysis 2007, Ft. Lauderdale, FL, USA, 20070805, 20070809
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MATERIALS; MICROANALYSIS; MICROSCOPY

Citation Formats

Howe, Jane Y. Structure of Polycrystalline Thermoelectric Bulk Material AgPbmSbTe2+m. United States: N. p., 2007. Web.
Howe, Jane Y. Structure of Polycrystalline Thermoelectric Bulk Material AgPbmSbTe2+m. United States.
Howe, Jane Y. Mon . "Structure of Polycrystalline Thermoelectric Bulk Material AgPbmSbTe2+m". United States. doi:.
@article{osti_983810,
title = {Structure of Polycrystalline Thermoelectric Bulk Material AgPbmSbTe2+m},
author = {Howe, Jane Y},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

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  • The local structure of the AgPb{sub m}SbTe{sub m+2} series of thermoelectric materials has been studied using the atomic pair distribution function (PDF) method. Three candidate-models were attempted for the structure of this class of materials using either a one- or a two-phase modeling procedure. Combining modeling the PDF with HRTEM data we show that AgPb{sub m}SbTe{sub m+2} contains nanoscale inclusions with composition close to AgPb{sub 3}SbTe{sub 5} randomly embedded in a PbTe matrix.
  • We report on the preparation and thermoelectric properties of the quaternary system AgPb{sub m}BiTe{sub 2+m} (Bismuth-Lead-Silver-Tellurium, BLST-m) that were nanostructured by mechanical alloying. Nanopowders of various compositions were compacted by three different methods: cold pressing/annealing, hot pressing, and short term sintering. The products are compared with respect to microstructure and sample density. The thermoelectric properties were measured: thermal conductivity in the temperature range from 300 K to 800 K and electrical conductivity and Seebeck coefficient between 100 K and 800 K. The compacting method and the composition had a substantial impact on carrier concentration and mobility as well as on the thermoelectric parameters. Roommore » temperature Hall measurements yielded carrier concentrations in the order of 10{sup 19 }cm{sup −3}, slightly increasing with increasing content of the additive silver bismuth telluride to the lead telluride base. ZT values close to the ones of bulk samples were achieved. X-ray diffraction and transmission electron microscopy (TEM) showed macroscopically homogeneous distributions of the constituting elements inside the nanopowders ensembles, indicating a solid solution. However, high resolution transmission electron microscopy (HRTEM) revealed disorder on the nanoscale inside individual nanopowders grains.« less
  • Hydrothermally synthesized AgPb{sub m}SbSe{sub m+2} (m=10, 12, 16, 18) nanoparticles with diameters of 20-50 nm were compacted by pressureless sintering. The Seebeck coefficient and electrical conductivity of the samples were measured from room temperature up to {approx}750 K. The samples show large and positive values of the Seebeck coefficient and moderate electrical conductivity. The thermoelectric properties of Ag{sub x}Pb{sub 18}SbSe{sub 20} (x=0.8, 0.85) and AgPb{sub 18}SbSe{sub 20-y}Te{sub y} (y=1, 3) samples have also been studied. It has been found that Ag{sub 0.85}Pb{sub 18}SbSe{sub 20} sample has a higher thermoelectric power factor. A significant difference in thermoelectric properties has also beenmore » observed for the AgPb{sub 18}SbSe{sub 20} samples prepared with pressureless sintering and spark plasma sintering. - Graphical abstract: SEM image of the fracture surface of an Ag{sub 0.85}Pb{sub 18}SbSe{sub 20} nano/micron composite material prepared by spark plasma sintering of hydrothermally synthesized nanopowders.« less