The effect of Te substitution for sb on thermoelectric properties of tetrahedrite

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Abstract

We present the study of the effect of Te substitution on the thermoelectric properties for Sb in Cu12Sb4-x Te x S 13 tetrahedrite compounds with x ranging from 0.2 to 1.5 in the temperature range of room temperature to 723 K. Powder x-ray diffraction and electron microscopy results indicate a successful homogenous substitution without the alteration of the crystal structure or the introduction of secondary phases. Thermoelectric property measurements show that the excess electrons from Te during the substitution fill the unoccupied levels near the top of the valence bands in pure Cu12Sb4S13 compound, moving the Fermi level closer to the top of the valence bands. This leads to an enhancement in thermopower but also to an increase in electrical resistivity. Overall, the reduction in total thermal conductivity gives rise to improved ZT values in all substituted samples. The highest ZT value obtained in this study is 0.92 at 723 K for x = 1, which is comparable to that of other p-type bulk thermoelectric materials.

LanguageEnglish (US)
Pages1983-1987
Number of pages5
JournalJournal of Electronic Materials
Volume43
Issue number6
DOIs
StatePublished - 2014

Profile

Substitution reactions
substitutes
Valence bands
valence
thermoelectric materials
Thermoelectric power
Fermi level
Powders
Electron microscopy
Thermal conductivity
electron microscopy
x ray diffraction
thermal conductivity
Diffraction
Crystal structure
microscopy
X rays
Temperature
electrical resistivity
crystal structure

Keywords

  • Low thermal conductivity
  • mineral-based compound
  • tetrahedrites
  • thermoelectric

ASJC Scopus subject areas

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

Cite this

The effect of Te substitution for sb on thermoelectric properties of tetrahedrite. / Lu, Xu; Morelli, Donald.

In: Journal of Electronic Materials, Vol. 43, No. 6, 2014, p. 1983-1987.

Research output: Contribution to journalArticle

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AB - We present the study of the effect of Te substitution on the thermoelectric properties for Sb in Cu12Sb4-x Te x S 13 tetrahedrite compounds with x ranging from 0.2 to 1.5 in the temperature range of room temperature to 723 K. Powder x-ray diffraction and electron microscopy results indicate a successful homogenous substitution without the alteration of the crystal structure or the introduction of secondary phases. Thermoelectric property measurements show that the excess electrons from Te during the substitution fill the unoccupied levels near the top of the valence bands in pure Cu12Sb4S13 compound, moving the Fermi level closer to the top of the valence bands. This leads to an enhancement in thermopower but also to an increase in electrical resistivity. Overall, the reduction in total thermal conductivity gives rise to improved ZT values in all substituted samples. The highest ZT value obtained in this study is 0.92 at 723 K for x = 1, which is comparable to that of other p-type bulk thermoelectric materials.

KW - Low thermal conductivity

KW - mineral-based compound

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