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- W4313731519 startingPage "168802" @default.
- W4313731519 abstract "A novel layered (Ca0.35Sr0.2Ba0.15Na0.2Bi0.1)3Co4O9 high-entropy ceramic is prepared for the first time by the traditional solid-state reaction. The XRD, SEM-EDS and TEM data exhibit that the multi-component cations can be introduced into the Ca site to form a single-phase and homogeneous solid solution with highly preferential crystal orientation and multi-scale structural defects. The textured high-entropy ceramic, compared to the pristine Ca3Co4O9 sample, shows a significantly increased electrical conductivity due to the higher carrier mobility derived from the c-axis selective orientation, and obtains an enhanced power factor of 0.27 mW·m−1·K−2. Besides, high entropy induced multi-dimensional lattice defects can act as the phonon scattering centers to effectively suppress the lattice thermal conductivity, and achieves an ultralow thermal conductivity of 0.87 W·m−1·K−1 as well as a peak figure-of-merit of 0.3 at 973 K, which is about 2.5 times larger than that of Ca3Co4O9. Our work deeply reveals the impact of the microstructure on thermoelectric properties in a high-entropy ceramic, which may help to advance the understanding and design of high-entropy thermoelectric materials." @default.
- W4313731519 created "2023-01-08" @default.
- W4313731519 creator A5006655484 @default.
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- W4313731519 date "2023-04-01" @default.
- W4313731519 modified "2023-10-18" @default.
- W4313731519 title "Ultralow thermal conductivity and enhanced thermoelectric properties in a textured (Ca0.35Sr0.2Ba0.15Na0.2Bi0.1)3Co4O9 high-entropy ceramic" @default.
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- W4313731519 doi "https://doi.org/10.1016/j.jallcom.2023.168802" @default.
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