Investigation of Al substitution on the thermoelectric properties of SrSi2

Y. K. Kuo, Chin-Shan Lue, G. Hsu, J. Y. Huang, H. L. Hsieh

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We report the results of aluminum substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity of SrSi2-xAlx alloys with 0 ≤ x ≤ 0.20. It is found that the substitution of Al onto the Si sites of SrSi2 causes a significant decrease in the electrical resistivity and the Seebeck coefficient. The observations are associated with the downward shift of the Fermi level, due to hole-doping via Al substitution within a rigid-band scenario. The low-temperature thermal conductivity decreases markedly with increasing Al content. Analysis of the lattice thermal conductivity from the contribution of various thermal scattering mechanisms reveals that the reduction in the lattice thermal conductivity mainly arises from the grain-boundary and point-defect scattering of the phonons through chemical substitution.

Original languageEnglish
Pages (from-to)604-607
Number of pages4
JournalMaterials Chemistry and Physics
Volume137
Issue number2
DOIs
Publication statusPublished - 2012 Dec 14

Fingerprint

Thermal conductivity
Substitution reactions
thermal conductivity
substitutes
Seebeck coefficient
Seebeck effect
Scattering
electrical resistivity
Point defects
Phonons
Fermi level
Aluminum
scattering
Crystal lattices
point defects
Grain boundaries
phonons
grain boundaries
Doping (additives)
aluminum

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Kuo, Y. K. ; Lue, Chin-Shan ; Hsu, G. ; Huang, J. Y. ; Hsieh, H. L. / Investigation of Al substitution on the thermoelectric properties of SrSi2. In: Materials Chemistry and Physics. 2012 ; Vol. 137, No. 2. pp. 604-607.
@article{7d1b22ada2274103824cd3d84c29d4ad,
title = "Investigation of Al substitution on the thermoelectric properties of SrSi2",
abstract = "We report the results of aluminum substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity of SrSi2-xAlx alloys with 0 ≤ x ≤ 0.20. It is found that the substitution of Al onto the Si sites of SrSi2 causes a significant decrease in the electrical resistivity and the Seebeck coefficient. The observations are associated with the downward shift of the Fermi level, due to hole-doping via Al substitution within a rigid-band scenario. The low-temperature thermal conductivity decreases markedly with increasing Al content. Analysis of the lattice thermal conductivity from the contribution of various thermal scattering mechanisms reveals that the reduction in the lattice thermal conductivity mainly arises from the grain-boundary and point-defect scattering of the phonons through chemical substitution.",
author = "Kuo, {Y. K.} and Chin-Shan Lue and G. Hsu and Huang, {J. Y.} and Hsieh, {H. L.}",
year = "2012",
month = "12",
day = "14",
doi = "10.1016/j.matchemphys.2012.10.009",
language = "English",
volume = "137",
pages = "604--607",
journal = "Materials Chemistry and Physics",
issn = "0254-0584",
publisher = "Elsevier BV",
number = "2",

}

Investigation of Al substitution on the thermoelectric properties of SrSi2. / Kuo, Y. K.; Lue, Chin-Shan; Hsu, G.; Huang, J. Y.; Hsieh, H. L.

In: Materials Chemistry and Physics, Vol. 137, No. 2, 14.12.2012, p. 604-607.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation of Al substitution on the thermoelectric properties of SrSi2

AU - Kuo, Y. K.

AU - Lue, Chin-Shan

AU - Hsu, G.

AU - Huang, J. Y.

AU - Hsieh, H. L.

PY - 2012/12/14

Y1 - 2012/12/14

N2 - We report the results of aluminum substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity of SrSi2-xAlx alloys with 0 ≤ x ≤ 0.20. It is found that the substitution of Al onto the Si sites of SrSi2 causes a significant decrease in the electrical resistivity and the Seebeck coefficient. The observations are associated with the downward shift of the Fermi level, due to hole-doping via Al substitution within a rigid-band scenario. The low-temperature thermal conductivity decreases markedly with increasing Al content. Analysis of the lattice thermal conductivity from the contribution of various thermal scattering mechanisms reveals that the reduction in the lattice thermal conductivity mainly arises from the grain-boundary and point-defect scattering of the phonons through chemical substitution.

AB - We report the results of aluminum substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity of SrSi2-xAlx alloys with 0 ≤ x ≤ 0.20. It is found that the substitution of Al onto the Si sites of SrSi2 causes a significant decrease in the electrical resistivity and the Seebeck coefficient. The observations are associated with the downward shift of the Fermi level, due to hole-doping via Al substitution within a rigid-band scenario. The low-temperature thermal conductivity decreases markedly with increasing Al content. Analysis of the lattice thermal conductivity from the contribution of various thermal scattering mechanisms reveals that the reduction in the lattice thermal conductivity mainly arises from the grain-boundary and point-defect scattering of the phonons through chemical substitution.

UR - http://www.scopus.com/inward/record.url?scp=84870059336&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84870059336&partnerID=8YFLogxK

U2 - 10.1016/j.matchemphys.2012.10.009

DO - 10.1016/j.matchemphys.2012.10.009

M3 - Article

VL - 137

SP - 604

EP - 607

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

SN - 0254-0584

IS - 2

ER -