当前位置: X-MOL 学术J. Materiomics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Optimization of the average figure-of-merit zT in medium-entropy GeTe-based materials via entropy engineering
Journal of Materiomics ( IF 9.4 ) Pub Date : 2024-03-26 , DOI: 10.1016/j.jmat.2024.02.014
Xusheng Liu , Keli Wang , Peng Li , Qiqi Tang , Zhenlong Huang , Yuan Lin , Wu Wang , Binbin Jiang , Jiaqing He

Entropy engineering has emerged as an effective strategy for improving the figure-of-merit by decelerating the phonon transport while maintaining good electrical transport properties of thermoelectric materials. Herein, a high average of 1.54 and a maximum of 2.1 are achieved in the mid-entropy GeTe constructed by Ag, Sb, and Pb alloying. At room temperature, the mid-entropy GeTe tends to be a cubic structure. And the power factor is improved from 7.7 μW·cm·K to 16.2 μW·cm·K due to the large increase in effective mass and the optimized carrier concentration. The increasing disorder created by heavy and off-centering Ag, Sb, and Pb atoms induces strong mass/strain fluctuations and phonon scattering to decelerate the phonon transport in GeTe. A low lattice thermal conductivity is obtained in the medium-entropy GeTe-based material. Moreover, a GeTe-based thermoelectric cooler is fabricated with the cooling temperature difference of 66.6 K with the hot end fixed at 363 K. This work reveals the effectiveness of entropy engineering in improving the average in GeTe and shows potential application of GeTe as a thermoelectric cooler.

中文翻译:


通过熵工程优化中熵 GeTe 基材料的平均品质因数 zT



熵工程已成为一种有效策略,可通过减慢声子传输速度同时保持热电材料良好的电传输特性来提高品质因数。在此,由 Ag、Sb 和 Pb 合金化构建的中熵 GeTe 实现了 1.54 的高平均值和 2.1 的最大值。在室温下,中熵GeTe往往呈立方结构。由于有效质量的大幅增加和载流子浓度的优化,功率因数从7.7 μW·cm·K提高到16.2 μW·cm·K。由重且偏心的 Ag、Sb 和 Pb 原子产生的无序性增加会引起强烈的质量/应变波动和声子散射,从而减缓 GeTe 中的声子传输。中熵GeTe基材料获得了低晶格热导率。此外,还制造了一种基于 GeTe 的热电冷却器,其冷却温差为 66.6 K,热端固定在 363 K。这项工作揭示了熵工程在提高 GeTe 平均温度方面的有效性,并展示了 GeTe 作为热电材料的潜在应用。更凉爽。
更新日期:2024-03-26
down
wechat
bug