中文版 | English
CSpace
Decreased order-disorder transition temperature and enhanced phonon scattering in Ag-alloyed Cu3SbSe3
Dai, Lu1,5; Wang, Zhiran1,5; Huo, Yufeng1,5; Huang, Yuling6; Wang, Guiwen3; Fan, Lizhu2,6; Chen, Peng1,5; Han, Guang4; Lu, Xu2; Zhang, Bin3
2022-10-25
摘要Cu3SbSe3 is a promising thermoelectric material with ultralow lattice thermal conductivity, especially at temperatures above 450 K at which the order-disorder transition of copper ions takes place. To investigate whether the high-temperature disordered phase can be extended to lower temperature, a series of Ag-alloyed Cu3-xAgxSbSe3 (x = 0, 0.1, 0.2 and 0.3) polycrystalline samples were synthesized and characterized in this work. It was found that the Ag-alloying shifts the order-disorder transition temperature to lower ones, which is beneficial to the thermoelectric application of Cu3SbSe3. For thermal transport, Ag-alloying is effective in suppressing lattice thermal conductivity in the copper-ions-ordered region, while in the copper-ions-disordered region, Ag-alloying barely has any effect on lattice thermal conductivity, as the phonon scattering is dominated by the liquid-like behavior of copper ions. Although Ag and Cu atoms have the same valence electron number, the carrier concentration is slightly increased after Ag-alloying, which suppresses the bipolar effect and increases the Seebeck coefficient at high temperatures. Finally, a maximum zT of 0.34 is obtained at 652 K for the sample Cu2.7Ag0.3SbSe3, which is 161% higher than that of the pristine sample. (c) 2022 Elsevier B.V. All rights reserved.
关键词Thermoelectric Cu3SbSe3 Lattice thermal conductivity Phase transition Ag-alloying
DOI10.1016/j.jallcom.2022.165829
发表期刊JOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
卷号919页码:7
通讯作者Zhang, Bin(xinyun2017@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000816147000003
语种英语