Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA.
J Phys Condens Matter. 2010 Jan 27;22(3):035801. doi: 10.1088/0953-8984/22/3/035801. Epub 2009 Dec 16.
We have measured the thermal transport properties over the temperature range 1.8 K<T<700 K of a two-phase alloy synthesized by reacting AgSbTe(2) and Ag(2)Se in a 1:1 molar ratio. Typical electrical resistivity values at 700 K are in the range ∼4 mΩ cm≤ρ≤20 mΩ cm, while low thermal conductivity values (κ<1 W m(-1) K(-1)) were obtained. We find that the thermal conductivity of this crystalline alloy has a temperature dependence strikingly similar to those of amorphous solids. In addition the thermal conductivity, thermopower, and electrical resistivity decouple. This result makes it possible to optimize thermoelectric performance by minimizing the electrical resistivity. It is therefore envisaged that this system has potential as a high performance bulk thermoelectric.
我们测量了通过反应 AgSbTe(2) 和 Ag(2)Se 以 1:1 摩尔比合成的两相合金在 1.8 K<T<700 K 的温度范围内的热输运性质。在 700 K 时的典型电阻率值在 ∼4 mΩ cm≤ρ≤20 mΩ cm 的范围内，而低导热率值（κ<1 W m(-1) K(-1)）则被获得。我们发现，这种晶态合金的热导率具有与非晶态固体非常相似的温度依赖性。此外，热导率、热电势和电阻率解耦。这一结果使得通过最小化电阻率来优化热电性能成为可能。因此，预计该系统有可能作为一种高性能的块状热电材料。
