Structure, heat capacity, and high-temperature thermal properties of Yb 14Mn 1-xAl xSb 11

Catherine A. Cox, Eric S. Toberer, Andrey A. Levchenko, Shawna R. Brown, G. Jeffrey Snyder, Alexandra Navrotsky, Susan M. Kauzlarich

Research output: Contribution to journalArticle

80 Scopus citations

Abstract

A series of compounds, Yb 14Mn 1-xAl xSb 11 with (0 < x < 1), was prepared via Sn flux and the structures investigated. Single-crystal X-ray diffraction reveals that the volume of the unit cell increases with increasing Al content. Bond-distance changes are less than 2% and the increase in volume of the unit cell is associated with the decreasing distortion of the tetrahedron with increasing Al content. The specific heat, C p, was measured from 300 to 1100 K. The measured C p for these compounds is 19% higher than the Dulong-Petit value at the peak zT temperature (1223 K). These measured values permit a recalculation of thermal conductivity, revealing an extremely low lattice thermal conductivity of approximately 0.3-0.4 W/(m K) at 1223 K. The maximum zT of Yb 14Mn1-;Al xSb 11 is approximately 0.8 and 1.1 for the x = 0 and x = 0.6 compositions, respectively.

Original languageEnglish (US)
Pages (from-to)1354-1360
Number of pages7
JournalChemistry of Materials
Volume21
Issue number7
DOIs
StatePublished - Apr 14 2009

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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    Cox, C. A., Toberer, E. S., Levchenko, A. A., Brown, S. R., Snyder, G. J., Navrotsky, A., & Kauzlarich, S. M. (2009). Structure, heat capacity, and high-temperature thermal properties of Yb 14Mn 1-xAl xSb 11 Chemistry of Materials, 21(7), 1354-1360. https://doi.org/10.1021/cm803252r