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- W2997587633 abstract "Herein the effect of Co element doping on the thermoelectric properties of n-type Bi2(Te0.97Se0.03)3 alloys fabricated by a melting synthesis technique followed by spark plasma sintering was reported. The micro-morphology and composition of the specimens was characterized by means of X-ray diffraction and scanning electron microscopy. The electrical and thermal properties of (Bi1-xCox)2(Te0.97Se0.03)3 with x = 0%, 2%, 4% and 8% were measured from 298K to 473K. We found that (i) the micro-scale secondary phase CoTe2 was embedded into the matrix due to the low solubility of Co element; (ii) Co doping generally improved the effective mass due to the scattering by local magnetic moments carried by Co ion and practically retained the carrier concentration, thereby yielding the higher Seebeck coefficient; (iii)both the electronic and lattice thermal conductivity decreased simultaneously by introducing the hierarchical defects (point defects and the micro-scale defects). Specifically, the x = 8% sample obtained a minimum thermal conductivity ~1.26 Wm−1K−1 at 398K. This results in a maximum ZT value of ~0.77, approximately ~20% higher than that of pristine Bi2(Te0.97Se0.03)3." @default.
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- W2997587633 date "2020-03-01" @default.
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- W2997587633 title "Synergistic regulation of electrical-thermal effect leading to an optimized thermoelectric performance in Co doping n-type Bi2(Te0.97Se0.03)3" @default.
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- W2997587633 doi "https://doi.org/10.1016/j.intermet.2019.106683" @default.
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