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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Preparation and thermoelectric properties of bulk in situ nanocomposites with amorphousanocrystal hybrid structure
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Preparation and thermoelectric properties of bulk in situ nanocomposites with amorphousanocrystal hybrid structure

机译：具有非晶/纳米杂化结构的块状原位纳米复合材料的制备和热电性能

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摘要

The amorphous partial crystallization method has been applied to fabricate Ge-Te based bulk in situ thermoelectric amorphousanocrystal composites. High-resolution transmission electron microscopy showed that nanocrystals of only 4-8 nm were formed by nanoscale phase separation from the semiconductor amorphous matrix during annealing between the glass transition and the crystallization temperatures. The electrical conductivity and the thermoelectric power factor of the amorphousanocrystal composite annealed at 443 K for 2 h were about three orders of magnitude larger than those of the amorphous precursor. The amorphous nanocomposite exhibited a lower thermal conductivity and a higher figure of merit, compared with the crystalline GeTe alloy. This work provides a new approach to develop new bulk nanocomposites for thermoelectric applications.
机译：非晶部分结晶方法已经被用于制造基于Ge-Te的块状原位热电非晶/纳米晶体复合材料。高分辨率透射电子显微镜表明，在玻璃化转变和结晶温度之间的退火过程中，通过从半导体非晶基质中进行纳米级相分离，仅形成了4-8 nm的纳米晶体。在443 K下退火2 h的非晶/纳米晶体复合材料的电导率和热电功率因数比非晶前体的电导率和热功率因数大约三个数量级。与结晶的GeTe合金相比，非晶态的纳米复合材料表现出较低的热导率和较高的品质因数。这项工作为开发用于热电应用的新型块状纳米复合材料提供了一种新方法。

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