Synthesis, crystal structure, and thermoelectric properties of the YbAl 3-ScAl 3 solid solution

Gloria J. Lehr, Donald T. Morelli

Research output: Contribution to journalArticle

  • 12 Citations

Abstract

The Yb 1-xSc xAl 3 alloy solid solution has been successfully synthesized for 0 ≤ x ≤ 1 by a combination of arc melting, pulverization, and consolidation by pulsed electric current sintering. The thermoelectric properties of the alloys have been investigated over the temperature range 80-300 K. Our results on pure YbAl 3 confirm previous studies demonstrating the combination of low electrical resistivity (∼100 μω cm) and large Seebeck coefficient (∼85 μV K -1) at 300 K. With increasing values of x the alloys become even more metallic, but the Seebeck coefficient decreases more gradually than the resistivity, resulting in enhanced thermoelectric power factor for 0 ≤ x ≤ 1. An increase in electronic thermal conductivity is partially offset by a strong suppression in lattice thermal conductivity that arises due to alloy scattering. As a result, the thermoelectric figure of merit of alloys with x = 0.25 is increased by 30% relative to YbAl 3 at 250 K.

LanguageEnglish (US)
Pages225-229
Number of pages5
JournalIntermetallics
Volume32
DOIs
StatePublished - Jan 2013

Profile

Solid solutions
Crystal structure
Seebeck coefficient
Thermal conductivity
Spark plasma sintering
Thermoelectric power
Consolidation
Melting
Scattering
Temperature

Keywords

  • A. Trialuminides
  • B. Thermoelectric properties

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Chemistry(all)

Cite this

Synthesis, crystal structure, and thermoelectric properties of the YbAl 3-ScAl 3 solid solution. / Lehr, Gloria J.; Morelli, Donald T.

In: Intermetallics, Vol. 32, 01.2013, p. 225-229.

Research output: Contribution to journalArticle

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