Development and evolution of nanostructure in bulk thermoelectric Pb-Te-Sb alloys

Teruyuki Ikeda; Vilupanur A. Ravi; Lauren A. Collins; Sossina M. Haile; G. Jeffrey Snyder

doi:10.1007/s11664-007-0175-8

Development and evolution of nanostructure in bulk thermoelectric Pb-Te-Sb alloys

Teruyuki Ikeda^*, Vilupanur A. Ravi, Lauren A. Collins, Sossina M. Haile, G. Jeffrey Snyder

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Motivated by reports of exceptionally high zT > 2 in thin film superlattices or "quantum well" materials with nanometer sized features, we have undertaken a study of composite materials with nanoscale features that promise to provide similar structures in bulk material. Nanometer scale layers of PbTe and Sb ₂Te ₃ with periodicities of 180 nm to 950 nm form when quenched eutectic PbTe-Sb ₂Te ₃ melt, crystallizing as Pb ₂Sb ₆Te ₁₁, subsequently annealed. The lamellar spacing depends on the temperature and time of the anneal. The mechanism for the development of the nanostructures is probed by examining the fraction of material transformed as a function of anneal time. Preliminary analysis of the shape factor exponent reveals that the transformation to the nanostructured lamellae bears similarities to the thickening of very large plates. The coarsening of the lamellar spacing is also examined as a function of time and temperature.

Original language	English (US)
Pages (from-to)	716-720
Number of pages	5
Journal	Journal of Electronic Materials
Volume	36
Issue number	7
DOIs	https://doi.org/10.1007/s11664-007-0175-8
State	Published - Jul 2007

Funding

This work was supported by the Office of Naval Research. LC was supported by the SURF program at Caltech.

Keywords

Coarsening
Fraction transformed
Lamellar spacing
Thermoelectric

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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10.1007/s11664-007-0175-8

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title = "Development and evolution of nanostructure in bulk thermoelectric Pb-Te-Sb alloys",

abstract = "Motivated by reports of exceptionally high zT > 2 in thin film superlattices or {"}quantum well{"} materials with nanometer sized features, we have undertaken a study of composite materials with nanoscale features that promise to provide similar structures in bulk material. Nanometer scale layers of PbTe and Sb 2Te 3 with periodicities of 180 nm to 950 nm form when quenched eutectic PbTe-Sb 2Te 3 melt, crystallizing as Pb 2Sb 6Te 11, subsequently annealed. The lamellar spacing depends on the temperature and time of the anneal. The mechanism for the development of the nanostructures is probed by examining the fraction of material transformed as a function of anneal time. Preliminary analysis of the shape factor exponent reveals that the transformation to the nanostructured lamellae bears similarities to the thickening of very large plates. The coarsening of the lamellar spacing is also examined as a function of time and temperature.",

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author = "Teruyuki Ikeda and Ravi, {Vilupanur A.} and Collins, {Lauren A.} and Haile, {Sossina M.} and Snyder, {G. Jeffrey}",

note = "Funding Information: This work was supported by the Office of Naval Research. LC was supported by the SURF program at Caltech.",

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AU - Ravi, Vilupanur A.

AU - Collins, Lauren A.

AU - Haile, Sossina M.

AU - Snyder, G. Jeffrey

N1 - Funding Information: This work was supported by the Office of Naval Research. LC was supported by the SURF program at Caltech.

PY - 2007/7

Y1 - 2007/7

N2 - Motivated by reports of exceptionally high zT > 2 in thin film superlattices or "quantum well" materials with nanometer sized features, we have undertaken a study of composite materials with nanoscale features that promise to provide similar structures in bulk material. Nanometer scale layers of PbTe and Sb 2Te 3 with periodicities of 180 nm to 950 nm form when quenched eutectic PbTe-Sb 2Te 3 melt, crystallizing as Pb 2Sb 6Te 11, subsequently annealed. The lamellar spacing depends on the temperature and time of the anneal. The mechanism for the development of the nanostructures is probed by examining the fraction of material transformed as a function of anneal time. Preliminary analysis of the shape factor exponent reveals that the transformation to the nanostructured lamellae bears similarities to the thickening of very large plates. The coarsening of the lamellar spacing is also examined as a function of time and temperature.

AB - Motivated by reports of exceptionally high zT > 2 in thin film superlattices or "quantum well" materials with nanometer sized features, we have undertaken a study of composite materials with nanoscale features that promise to provide similar structures in bulk material. Nanometer scale layers of PbTe and Sb 2Te 3 with periodicities of 180 nm to 950 nm form when quenched eutectic PbTe-Sb 2Te 3 melt, crystallizing as Pb 2Sb 6Te 11, subsequently annealed. The lamellar spacing depends on the temperature and time of the anneal. The mechanism for the development of the nanostructures is probed by examining the fraction of material transformed as a function of anneal time. Preliminary analysis of the shape factor exponent reveals that the transformation to the nanostructured lamellae bears similarities to the thickening of very large plates. The coarsening of the lamellar spacing is also examined as a function of time and temperature.

KW - Coarsening

KW - Fraction transformed

KW - Lamellar spacing

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Development and evolution of nanostructure in bulk thermoelectric Pb-Te-Sb alloys

Abstract

Funding

Keywords

ASJC Scopus subject areas

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