Realizing synergistic optimization of electrical and thermal transport properties in BiCuSeO ceramics via multi-element doping

Xu, Zhenjiu (avtor), Wang, Honglei (avtor), Jiang, Jia-Ling (avtor), Fu, Zhuang (avtor), Dong, Songtao (avtor), Zhang, Binbin (avtor), Ju, Hongbo (avtor)

In this study, the design of high-entropy alloys (multi-element substitution, Al▫$^{3+}$▫/La▫$^{3+}$▫/Sb▫$^{3+}$▫/Y▫$^{3+}$▫) was used to increase material entropy and improve heat scattering to further reduce thermal conductivity. Concurrently, Ca▫$^{2+}$▫ ion hole doping was used to improve its electrical conductivity. Therefore, a series of Bi▫$_{0.92- x}$▫Al▫$_{0.02}$▫La▫$_{0.02}$▫Sb▫$_{0.02}$▫Y▫$_{0.02}$▫Ca▫$_x$▫CuSeO (x = 0, 0.02, 0.06, 0.10, and 0.14) ceramics was prepared using a combination of high-energy ball milling and cold isostatic pressing. The multi-element substitution of Al▫$_{0.02}$▫La▫$_{0.02}$▫Sb▫$_{0.02}$▫Y▫$_{0.02}$▫Ca▫$_{0.02}$▫ in the Bi site resulted in a minimum thermal conductivity of 0.35 Wm▫$^{-1}$▫K▫$^{-1}$▫, which is one-third of that of intrinsic BiCuSeO. Simultaneously, the conductivity increased up to 10–20 times that of intrinsic BiCuSeO, proportional to the amount of Ca▫$^{2+}$▫ doping. Furthermore, the optimum component Bi▫$_{0.82}$▫Al▫$_{0.02}$▫La▫$_{0.02}$▫Sb▫$_{0.02}$▫Y▫$_{0.02}$▫Ca▫$_{0.10}$▫CuSeO exhibited an extremely high power factor of 568.55 μWm▫$^{-1}$▫K▫$^{-2}$▫ at 773 K, significantly higher than that of pure BiCuSeO (148.7 μWm▫$^{-1}$▫K▫$^{-2}$▫). Consequently, a peak ZT value of approximately 1.12 was achieved at 773 K, which was 4.48 times higher than that of the pristine BiCuSeO specimen (approximately 0.25). Our findings provide a novel strategy to optimize the thermoelectric properties of BiCuSeO and other materials.

• Jezik: Angleški jezik
• Ključne besede: DC magnetron sputtering system, W-Ti-N/Ag composite film, microstructure, mechanical properties
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2025
• Št. strani: 8 str.
• Številčenje: Vol. 1010, art. 177471
• PID: 20.500.12556/RUL-168378
• UDK: 620.21
• ISSN pri članku: 1873-4669
• DOI: 10.1016/j.jallcom.2024.177471
• COBISS.SI-ID: 232109827
• Datum objave v RUL: 04.07.2025

Gradivo je del revije

• Naslov: Journal of alloys and compounds
• Založnik: Elsevier
• ISSN: 1873-4669
• COBISS.SI-ID: 23089925

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: DC magnetronski razpršilni sistem, W-Ti-N/Ag kompozitni filmi, mikrostruktura, mehanske lastnosti