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Issue 7, 2017
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Improvements of thermoelectric properties for p-type Cu1.8S bulk materials via optimizing the mechanical alloying process

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Abstract

Polycrystalline bulk Cu1.8S materials were fabricated using mechanical alloying (MA) and spark plasma sintering (SPS). The microstructure and thermoelectric transport properties were investigated in detail with emphasis on the effect of the mechanical alloying ball-milling process. Cu1.8S single-phase powders were directly synthesized from the elemental powders. High-density (>95%) p-type Cu1.8S bulk samples were fabricated using the subsequent SPS process at 773 K for 5 min. A Cu1.96S second phase was detected in the bulk samples when the ball-milling time was increased to 3 h, and the Cu1.96S content increased with increasing ball-milling time. The electrical properties and Seebeck coefficient of the Cu1.8S bulk samples were dependent on the milling time of the starting powders. The Cu1.8S bulk that was sintered by SPS using the powder treated with a 3 h ball-milling obtained a record-high power factor of 1552 μW m−1 K−2 at 773 K for the Cu–S system, which is 40% higher than that of pristine Cu1.8S. The ZT value of the Cu1.8S bulk sample that was sintered by SPS using the 12 h ball-milling treated powder reached 0.71, which is 67% higher than the ZT value of the sample that was sintered using the powder with a 1 h ball-milling time.

Graphical abstract: Improvements of thermoelectric properties for p-type Cu1.8S bulk materials via optimizing the mechanical alloying process

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Publication details

The article was received on 21 Apr 2017, accepted on 14 May 2017 and first published on 15 May 2017


Article type: Research Article
DOI: 10.1039/C7QI00208D
Citation: Inorg. Chem. Front., 2017,4, 1192-1199
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    Improvements of thermoelectric properties for p-type Cu1.8S bulk materials via optimizing the mechanical alloying process

    P. Qin, X. Qian, Z. Ge, L. Zheng, J. Feng and L. Zhao, Inorg. Chem. Front., 2017, 4, 1192
    DOI: 10.1039/C7QI00208D

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