Functionally Graded (PbTe)1–x(SnTe)x Thermoelectrics,Chemistry of Materials

当前位置： X-MOL 学术 › Chem. Mater. › 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.)

Functionally Graded (PbTe)1–x(SnTe)x Thermoelectrics
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-12-15 00:00:00 , DOI: 10.1021/acs.chemmater.7b04473
Ellen M. J. Hedegaard ₁ , Aref A. H. Mamakhel ₁ , Hazel Reardon ₁ , B. B. Iversen ₁

Affiliation

Functionally graded (PbTe)_1–x(SnTe)_x ingots have been prepared by Bridgman crystal growth method for the first time. From SEM-EDX, the composition (x) of the ingot was found to increase smoothly from 10.6 to 25.4 along the direction of the growth. The gradual change in composition is shown to cause a decrease in band gap as crystallization proceeds, and to be accompanied by a change in carrier concentration. By a Potential-Seebeck microprobe (PSM), a smoothly varying Seebeck coefficient was measured along the growth direction of the sample at room temperature. High-temperature properties relevant for thermoelectric performance were measured and used to evaluate the potential of this system as a functionally graded high-temperature thermoelectric material. This study provides insight into understanding the complicated interplays of advanced crystal growth and physical properties, going beyond standard thermoelectric sample preparation approaches.

中文翻译：

功能分级（PbTe）_{1– x}（SnTe）_x热电元件

通过Bridgman晶体生长方法首次制备了功能梯度（PbTe）_{1- x}（SnTe）_x铸锭。根据SEM-EDX，组成（x）的铸锭被发现沿着生长方向从10.6平稳地增加到25.4。随着结晶的进行，组成的逐渐变化显示出引起带隙的减小，并且伴随着载流子浓度的变化。通过电位塞贝克微探针（PSM），在室温下沿样品的生长方向测量了平滑变化的塞贝克系数。测量了与热电性能相关的高温特性，并用于评估该系统作为功能梯度高温热电材料的潜力。这项研究提供了深入了解高级晶体生长和物理特性之间复杂相互作用的见识，超越了标准的热电样品制备方法。

更新日期：2017-12-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11