Sturm Cheryl, Boccalon Natalie, Assoud Abdeljalil, Zou Tianze, Kycia Jan, Kleinke Holger
Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
Department of Physics and Astronomy and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
Inorg Chem. 2021 Sep 6;60(17):12781-12789. doi: 10.1021/acs.inorgchem.1c00925. Epub 2021 Aug 15.
The aim of this study was to investigate the thermoelectric properties of hot-pressed BaCuTe as well as its stability with regards to Cu ion movement. For the latter, two single crystals were picked from pellets after they were measured up to 573 and 673 K, which showed no significant changes in the occupancies of any of the Cu sites. All investigated BaCuTe materials displayed low thermal conductivity values (<1 W m K) and appropriate electrical conductivity values (300-600 Ω cm). However, the thermopower values were comparably low (<+65 μV K), resulting in uncompetitive values, with the highest being achieved for BaCuTe, namely = 0.12 at 570 K. In an attempt to decrease the thermal conductivity, and thereby enhance the figure of merit, a brief alloying study with Ag was undertaken. The incorporation of Ag, however, did not produce any significant improvements.
本研究的目的是研究热压BaCuTe的热电性能及其在铜离子移动方面的稳定性。对于后者，在将颗粒加热到573 K和673 K进行测量后，从中挑选了两块单晶，结果显示任何铜位点的占有率均无显著变化。所有研究的BaCuTe材料均显示出较低的热导率值（<1 W m K）和合适的电导率值（300 - 600 Ω cm）。然而，热功率值相对较低（< +65 μV K），导致性能缺乏竞争力，其中BaCuTe的性能最高，即在570 K时ZT = 0.12。为了降低热导率，从而提高优值，对Ag进行了简要的合金化研究。然而，加入Ag并没有带来任何显著的改善。
