On the study of PbTe-based nanocomposite thermoelectric materials

Th C. Hasapis; S. N. Girard; E. Hatzikraniotis; K. M. Paraskevopoulos; M. G. Kanatzidis

doi:10.4028/www.scientific.net/JNanoR.17.165

On the study of PbTe-based nanocomposite thermoelectric materials

Th C. Hasapis, S. N. Girard, E. Hatzikraniotis^*, K. M. Paraskevopoulos, M. G. Kanatzidis

^*Corresponding author for this work

Chemistry

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

4 Scopus citations

Abstract

We report on the structural and vibrational properties of the x = 0.11 and x = 0.33 compositions of a new class of nanostructured thermoelectric system (PbTe) _1-x(PbSnS ₂) _x by means of X-ray diffraction, scanning and transmission electron microscopy and infrared reflectivity. Both compositions are phase separated, where PbSnS ₂ self-segregates from PbTe to form features with dimensions ranging from tens of micrometers to tens of nanometers. Effective Medium Approximation was used in order to determine the volume fraction and the dielectric function of the nanoscale PbSnS ₂ embedded in PbTe. By comparing the phonon parameters of the nanoscale PbSnS ₂ and bulk PbSnS ₂ single crystals, we concluded that phonon confinement effects and bilayer thickness anisotropy within the PbSnS ₂ nanostructures embedded within PbTe are responsible for the observed variations in the frequencies of the shear and the compression modes not observed in pure crystals of PbSnS ₂.

Original language	English (US)
Pages (from-to)	165-174
Number of pages	10
Journal	Journal of Nano Research
Volume	17
DOIs	https://doi.org/10.4028/www.scientific.net/JNanoR.17.165
State	Published - Feb 3 2012

Keywords

Effective Medium Approximation
Infrared reflectivity
Nanostructures
Thermoelectrics

ASJC Scopus subject areas

General Materials Science
General Physics and Astronomy

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10.4028/www.scientific.net/JNanoR.17.165

Cite this

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title = "On the study of PbTe-based nanocomposite thermoelectric materials",

abstract = "We report on the structural and vibrational properties of the x = 0.11 and x = 0.33 compositions of a new class of nanostructured thermoelectric system (PbTe) 1-x(PbSnS 2) x by means of X-ray diffraction, scanning and transmission electron microscopy and infrared reflectivity. Both compositions are phase separated, where PbSnS 2 self-segregates from PbTe to form features with dimensions ranging from tens of micrometers to tens of nanometers. Effective Medium Approximation was used in order to determine the volume fraction and the dielectric function of the nanoscale PbSnS 2 embedded in PbTe. By comparing the phonon parameters of the nanoscale PbSnS 2 and bulk PbSnS 2 single crystals, we concluded that phonon confinement effects and bilayer thickness anisotropy within the PbSnS 2 nanostructures embedded within PbTe are responsible for the observed variations in the frequencies of the shear and the compression modes not observed in pure crystals of PbSnS 2.",

keywords = "Effective Medium Approximation, Infrared reflectivity, Nanostructures, Thermoelectrics",

author = "Hasapis, {Th C.} and Girard, {S. N.} and E. Hatzikraniotis and Paraskevopoulos, {K. M.} and Kanatzidis, {M. G.}",

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AU - Hasapis, Th C.

AU - Girard, S. N.

AU - Hatzikraniotis, E.

AU - Paraskevopoulos, K. M.

AU - Kanatzidis, M. G.

PY - 2012/2/3

Y1 - 2012/2/3

N2 - We report on the structural and vibrational properties of the x = 0.11 and x = 0.33 compositions of a new class of nanostructured thermoelectric system (PbTe) 1-x(PbSnS 2) x by means of X-ray diffraction, scanning and transmission electron microscopy and infrared reflectivity. Both compositions are phase separated, where PbSnS 2 self-segregates from PbTe to form features with dimensions ranging from tens of micrometers to tens of nanometers. Effective Medium Approximation was used in order to determine the volume fraction and the dielectric function of the nanoscale PbSnS 2 embedded in PbTe. By comparing the phonon parameters of the nanoscale PbSnS 2 and bulk PbSnS 2 single crystals, we concluded that phonon confinement effects and bilayer thickness anisotropy within the PbSnS 2 nanostructures embedded within PbTe are responsible for the observed variations in the frequencies of the shear and the compression modes not observed in pure crystals of PbSnS 2.

AB - We report on the structural and vibrational properties of the x = 0.11 and x = 0.33 compositions of a new class of nanostructured thermoelectric system (PbTe) 1-x(PbSnS 2) x by means of X-ray diffraction, scanning and transmission electron microscopy and infrared reflectivity. Both compositions are phase separated, where PbSnS 2 self-segregates from PbTe to form features with dimensions ranging from tens of micrometers to tens of nanometers. Effective Medium Approximation was used in order to determine the volume fraction and the dielectric function of the nanoscale PbSnS 2 embedded in PbTe. By comparing the phonon parameters of the nanoscale PbSnS 2 and bulk PbSnS 2 single crystals, we concluded that phonon confinement effects and bilayer thickness anisotropy within the PbSnS 2 nanostructures embedded within PbTe are responsible for the observed variations in the frequencies of the shear and the compression modes not observed in pure crystals of PbSnS 2.

KW - Effective Medium Approximation

KW - Infrared reflectivity

KW - Nanostructures

KW - Thermoelectrics

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JO - Journal of Nano Research

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On the study of PbTe-based nanocomposite thermoelectric materials

Abstract

Keywords

ASJC Scopus subject areas

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