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Published April 14, 2009 | Supplemental Material
Journal Article Open

Structure, heat capacity, and high-temperature thermal properties of Yb_(14)Mn_(1-x)Al_xSb_11


A series of compounds, Yb_(14)Mn_(1−x)Al_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_(14)Mn(1−x)Al_xSb_11 is approximately 0.8 and 1.1 for the x = 0 and x = 0.6 compositions, respectively.

Additional Information

© 2009 American Chemical Society. Published In Issue April 14, 2009 Article ASAP March 10, 2009; received: December 2, 2008; revised: January 21, 2009. Financial support from NSF DMR- 0600742, the NASA Jet Propulsion Laboratory, the Beckman Foundation, and NSF DMR 06-01892 (calorimetry) is gratefully acknowledged. C.C. acknowledges a NSF funded LSAMP Bridge to the Doctorate Fellowship. We thank Christine Beavers, Marilyn M. Olmstead, and Håkon Hope for useful discussion. X-ray crystallographic data for the single-crystal refinement of Yb14Mn1-xAlxSb11 (x ) 0.2, 0.4, 0.6, 0.8, and 0.95) (TXT). Backscattered electron and elemental mapping images of the pressed pellets and single crystal (x ) 6), respectively (PDF). This material is available free of charge via the Internet at http://pubs.acs.org.

Attached Files

Supplemental Material - cm803252r_si_001.pdf

Supplemental Material - cm803252r_si_002.txt


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