Three-Dimensional Atom-Probe Tomographic Analyses of Lead-Telluride Based Thermoelectric Materials

Kim, Yoon-Jun1; Blum, Ivan D.1; He, Jiaqing1,4; Kanatzidis, Mercouri G.2; Dravid, Vinayak P.1; Seidman, David N.1,3

2014-11

10.1007/s11837-014-1155-0

JOM   影响因子和分区

1047-4838

1543-1851

Precipitates in bulk p-type thermoelectric materials, PbTe-SrTe and PbTe-PbS, are studied using three-dimensional (3-D) atom-probe tomography (APT). APT is capable of characterizing chemically materials in 3-D with subnano-scale spatial resolution on an atom-by-atom basis, which enables us to characterize secondary phases in the PbTe matrix as well as the dopant distributions at different imperfections. We demonstrate that APT provides accurate information about the compositions and morphologies of nanoprecipitates. In the PbTe-SrTe system, different morphology of precipitates is observed and the SrTe composition is confirmed. Also, segregation of Na dopants at mesoscale imperfections, dislocations and grain boundaries, and at matrix/precipitate interfaces is observed. In the PbTe-PbS system, PbS precipitates are observed. The PbS precipitates exhibit faceting, and have a morphology that depends on the bulk Na concentration. A predominance of {100} faceted precipitates is observed for 2 mol.% Na. Using 3-D APT, we demonstrate that Na segregation at matrix/precipitate interfaces is most likely responsible for the change in their morphologies, which occurs by reducing the interfacial free energy of {100} facets.

SCI ; EI

英语

其他

ONR-DURIP[N00014-0400798] ; ONR-DURIP[N00014-0610539] ; ONR-DURIP[N00014-0910781]

Materials Science ; Metallurgy & Metallurgical Engineering ; Mineralogy ; Mining & Mineral Processing

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Mineralogy ; Mining & Mineral Processing

WOS:000344618900021

SPRINGER

20144100084187

Atoms ; Free energy ; Grain boundaries ; IV-VI semiconductors ; Lead compounds ; Morphology ; Precipitation (chemical) ; Probes ; Segregation (metallography) ; Sodium ; Strontium compounds ; Tellurium compounds ; Thermoelectric equipment ; Thermoelectricity

Metallography:531.2 ; Alkali Metals:549.1 ; Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Chemical Operations:802.3 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
2.Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
3.Northwestern Ctr Atom Probe Tomog, Evanston, IL 60208 USA
4.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

Kim, Yoon-Jun,Blum, Ivan D.,He, Jiaqing,et al. Three-Dimensional Atom-Probe Tomographic Analyses of Lead-Telluride Based Thermoelectric Materials[J]. JOM,2014,66(11):2288-2297.

Kim, Yoon-Jun,Blum, Ivan D.,He, Jiaqing,Kanatzidis, Mercouri G.,Dravid, Vinayak P.,&Seidman, David N..(2014).Three-Dimensional Atom-Probe Tomographic Analyses of Lead-Telluride Based Thermoelectric Materials.JOM,66(11),2288-2297.

Kim, Yoon-Jun,et al."Three-Dimensional Atom-Probe Tomographic Analyses of Lead-Telluride Based Thermoelectric Materials".JOM 66.11(2014):2288-2297.