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- W4308661307 abstract "Ca 3-x Ag x Co 4-y Fe y O 9 (x=0, 0.05; y=0, 0.1, 0.2, 0.4) polycrystalline materials were prepared by sol-gel method with spark plasma sintering. The phase composition, microstructure and high temperature thermoelectric property of the bulk samples were systematically studied. The sintered Ca 3-x Ag x Co 4-y Fe y O 9 ceramics exhibit fine lamellar grain and dense morphology. Compared with single addition of Ag or Fe, appropriate co-additive amount of Ag and Fe can further increase electrical conductivity due to higher carrier concentration and mobility, while decreasing thermal conductivity by stronger phonon scattering. The coordinated regulation of electron and phonon transport is realized in Ca 2.95 Ag 0.05 Co 3.8 Fe 0.2 O 9 with the maximum ZT value of 0.25 at 1000 K, which is 34% larger than that of pure Ca 3 Co 4 O 9 . • Appropriate co-doping content of Ag and Fe in Ca 3 Co 4 O 9 can bring higher carrier concentration and mobility, while enhancing phonon scattering. • Simultaneously enhanced power factor and suppressed thermal conductivity can be achieved by Ag and Fe co-doping with appropriate doping contents. • Excessive doping of Fe would generate secondary phase FeO and deteriorate thermoelectric property." @default.
- W4308661307 created "2022-11-13" @default.
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- W4308661307 date "2022-12-01" @default.
- W4308661307 modified "2023-10-11" @default.
- W4308661307 title "Optimizing electrical and thermal transport properties of Ca3Co4O9 based thermoelectric materials by Ag and Fe co-addition" @default.
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- W4308661307 doi "https://doi.org/10.1016/j.mtcomm.2022.104866" @default.
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