Structure, Heat Capacity, and High-Temperature Thermal Properties of Yb14Mn1−xAlxSb11
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Abstract
A series of compounds, Yb14Mn1−-xAlxSb11 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, Cp, was measured from 300 to 1100 K. The measured Cp 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 Yb14Mn1−xAlxSb11 is approximately 0.8 and 1.1 for the x = 0 and x = 0.6 compositions, respectively.
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