Structure, Heat Capacity, and High-Temperature Thermal Properties of Yb14Mn1-xAlxSb11

被引：87

作者：

Cox, Catherine A. ^{[1
]}

Toberer, Eric S. ^{[4
]}

Levchenko, Andrey A. ^{[2
,3
]}

Brown, Shawna R. ^{[1
]}

Snyder, G. Jeffrey ^{[4
]}

Navrotsky, Alexandra ^{[2
,3
]}

Kauzlarich, Susan M. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA

[2] Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA

[3] Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA

[4] CALTECH, Pasadena, CA 91125 USA

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 07期

关键词：

THERMOELECTRIC-MATERIALS; TRANSPORT-PROPERTIES; ZINTL COMPOUNDS; PHONON-GLASS; YB14MNSB11; EFFICIENCY; ENHANCEMENT; YB14ZNSB11; TRANSITION; ALLOYS;

D O I：

10.1021/cm803252r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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, C-p, was measured from 300 to I 100 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 Yb14Mn1-xAlxSb11 is approximately 0.8 and 1.1 for the x = 0 and x = 0.6 compositions, respectively.

引用

页码：1354 / 1360

页数：7

共 31 条

[1] HIGH-TEMPERATURE HEAT CONTENTS, THERMAL DIFFUSIVITIES, DENSITIES, AND THERMAL-CONDUCTIVITIES OF N-TYPE SIGE(GAP),P-TYPE SIGE(GAP), AND P-TYPE SIGE ALLOYS [J].