Structure and high-temperature thermoelectric properties of SrAl2Si2

Susan M. Kauzlarich, Cathie L. Condron, Jonathan K. Wassei, Teruyuki Ikeda, G. Jeffrey Snyder

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Single crystals of SrAl2Si2 were synthesized by reaction of the elements in an aluminum flux at 1000 °C. SrAl2Si2 is isostructural to CaAl2Si2 and crystallizes in the hexagonal space group P-3m1 (90 K, a=4.1834 (2), c=7.4104 (2) Å, Z=1, R1=0.0156, wR2=0.0308). Thermal analysis shows that the compound melts at ∼1020 °C. Low-temperature resistivity on single crystals along the c-axis shows metallic behavior with room temperature resistivity value of ∼7.5 mΩ cm. High-temperature Seebeck, resistivity, and thermal conductivity measurements were made on hot-pressed pellets. The Seebeck coefficient shows negative values in entire temperature range decreasing from ∼-78 μV K-1 at room temperature to -34 μV K-1 at 1173 K. Seebeck coefficients are negative indicating n-type behavior; however, the temperature dependence is consistent with contribution from minority p-type carriers as well. The lattice contribution to the thermal conductivity is higher than for clathrate structures containing Al and Si, approximately 50 mW cm-1 K, and contributes to the overall low zT for this compound.

Original languageEnglish (US)
Pages (from-to)240-245
Number of pages6
JournalJournal of Solid State Chemistry
Volume182
Issue number2
DOIs
StatePublished - Feb 2009

Fingerprint

Seebeck effect
electrical resistivity
thermal conductivity
conductivity
Seebeck coefficient
single crystals
clathrates
room temperature
minorities
pellets
Temperature
Thermal conductivity
thermal analysis
Single crystals
aluminum
temperature dependence
Aluminum
Thermoanalysis
Fluxes
temperature

Keywords

  • Aluminum silicide
  • CaAlSi
  • High-temperature thermoelectric material
  • Silicides
  • Strontium
  • Ternary phase
  • Thermal conductivity
  • Thermoelectric
  • Zintl
  • ZT

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Kauzlarich, S. M., Condron, C. L., Wassei, J. K., Ikeda, T., & Snyder, G. J. (2009). Structure and high-temperature thermoelectric properties of SrAl2Si2 Journal of Solid State Chemistry, 182(2), 240-245. https://doi.org/10.1016/j.jssc.2008.09.028

Structure and high-temperature thermoelectric properties of SrAl2Si2 . / Kauzlarich, Susan M.; Condron, Cathie L.; Wassei, Jonathan K.; Ikeda, Teruyuki; Snyder, G. Jeffrey.

In: Journal of Solid State Chemistry, Vol. 182, No. 2, 02.2009, p. 240-245.

Research output: Contribution to journalArticle

Kauzlarich, SM, Condron, CL, Wassei, JK, Ikeda, T & Snyder, GJ 2009, 'Structure and high-temperature thermoelectric properties of SrAl2Si2 ', Journal of Solid State Chemistry, vol. 182, no. 2, pp. 240-245. https://doi.org/10.1016/j.jssc.2008.09.028
Kauzlarich, Susan M. ; Condron, Cathie L. ; Wassei, Jonathan K. ; Ikeda, Teruyuki ; Snyder, G. Jeffrey. / Structure and high-temperature thermoelectric properties of SrAl2Si2 In: Journal of Solid State Chemistry. 2009 ; Vol. 182, No. 2. pp. 240-245.
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