Abstract In this paper, Ge0.94Bi0.06Te was firstly fabricated by mechanical alloying. Compared with the Ge0.94Bi0.06Te sample prepared by the melting process, the maximum ZT achieved an improvement from 1.4 to 1.8. The thermoelectric performance of Ge0.94Bi0.06Te can be improved through suppressing Ge vacancies and refining grains via mechanical alloying. Further introducing nano-SiC into the matrix of Ge0.94Bi0.06Te improves thermoelectric performance by increasing Seebeck coefficient and reducing thermal conductivity. Meanwhile, the mechanical properties including the microhardness and Young's modulus are also enhanced by dispersing nano-SiC. Consequently, a maximum ZT ~ 2.1 at 723 K was achieved in GeTe-based materials.

中文翻译：

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通过分散纳米SiC协同提高Ge0.94Bi0.06Te的热电和机械性能

摘要 本文首次采用机械合金化方法制备了Ge0.94Bi0.06Te。与熔融法制备的 Ge0.94Bi0.06Te 样品相比，最大 ZT 值从 1.4 提高到 1.8。Ge0.94Bi0.06Te的热电性能可以通过机械合金化抑制Ge空位和细化晶粒来提高。进一步将纳米 SiC 引入 Ge0.94Bi0.06Te 基体中，通过增加塞贝克系数和降低热导率来改善热电性能。同时，纳米SiC的分散也提高了显微硬度和杨氏模量等力学性能。因此，在基于 GeTe 的材料中，在 723 K 时实现了最大 ZT ~ 2.1。