20.500.12556/RUL-168378 Realizing synergistic optimization of electrical and thermal transport properties in BiCuSeO ceramics via multi-element doping 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. DC magnetron sputtering system W-Ti-N/Ag composite film microstructure mechanical properties DC magnetronski razpršilni sistem W-Ti-N/Ag kompozitni filmi mikrostruktura mehanske lastnosti true false true Angleški jezik Slovenski jezik Članek v reviji 2025-04-11 04:17:13 2025-07-04 12:07:24 2025-07-05 04:40:36 0000-00-00 00:00:00 2025 0 0 8 str. art. 177471 Vol. 1010 January 2025 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2026-11-11 620.21 1873-4669 10.1016/j.jallcom.2024.177471 232109827 RAZ_Xu_Zhenjiu_2025.pdf RAZ_Xu_Zhenjiu_2025.pdf 1 C6B37650C570C88C0E246172097B4ED1 c4600d8128003480118d85483f5009d5c5937cf4e2f26c7fa7d4d9dfea2d0fe1 d2ef8db2-2029-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=209669 https://www.sciencedirect.com/science/article/pii/S0925838824040593 0 d94f586a-202a-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=209670 Fakulteta za strojništvo 0 0 0