Preparation of Tetrahedrite Cu12Sb4S13 by Mechanical Alloying and Hot Pressing

被引:0
作者
Sung-Yoon Kim
Sung-Gyu Kwak
Ji-Hee Pi
Go-Eun Lee
Il-Ho Kim
机构
[1] Korea National University of Transportation,Department of Materials Science and Engineering
来源
Journal of Electronic Materials | 2019年 / 48卷
关键词
Thermoelectric; tetrahedrite; mechanical alloying; hot pressing;
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摘要
Tetrahedrite Cu12Sb4S13 was synthesized via mechanical alloying (MA) and consolidated using hot pressing (HP) as a solid-state route. Powders with a single phase of Cu12Sb4S13 could be successfully synthesized without post-annealing by controlling the process conditions of MA: 350 rpm for 24 h in an Ar atmosphere. A sintered tetrahedrite with density close to the theoretical density was obtained via HP at 723 K for 2 h under a pressure of 70 MPa. Thermogravimetric and calorimetric analyses confirmed weight loss and endothermic reactions at temperatures above 853 K, possibly due to the decomposition/melting of the tetrahedrite and the volatilization/melting of the constituent elements. The synthesized tetrahedrite is a nondegenerate semiconductor; its electrical conductivity increased with the increase in temperature. Its Seebeck coefficient also increased with the increase in temperature without showing intrinsic conduction up to 773 K. As the HP temperature increased, the power factor decreased because the decrease in the electrical conductivity prevailed over the increase in the Seebeck coefficient. The thermal conductivity had similar low values regardless of the HP temperature. The maximum dimensionless figure-of-merit, ZTmax = 0.87, was obtained at 723 K for the Cu12Sb4S13 hot-pressed at 723 K.
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页码:1857 / 1863
页数:6
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  • [1] Lu X(2013)undefined Phys. Chem. Chem. Phys. 15 5762-undefined
  • [2] Morelli DT(2013)undefined Adv. Energy Mater. 3 342-undefined
  • [3] Lu X(1997)undefined Acta Crystallogr. 53 337-undefined
  • [4] Morelli DT(2015)undefined Phys. Chem. Chem. Phys. 17 19751-undefined
  • [5] Xia Y(2015)undefined Adv. Funct. Mater. 25 3648-undefined
  • [6] Zhou F(2014)undefined J. Appl. Phys. 115 193515-undefined
  • [7] Ozolins V(2005)undefined Phys. Chem. Miner. 32 155-undefined
  • [8] Chi H(1988)undefined Am. Miner. 73 389-undefined
  • [9] Zhou X(2008)undefined Phys. Chem. Miner. 35 455-undefined
  • [10] Uher C(2013)undefined J. Appl. Phys. 113 043712-undefined