Solid-State Synthesis and Thermoelectric Properties of Tetrahedrites Cu12Sb4-yBiyS13

Abstract

Tetrahedrite has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. The synthesis of tetrahedrite compounds by conventional melting methods requires a long-time reaction and annealing. However, a homogeneous and solid-state synthesis can be conducted in a short time using mechanical alloying (MA) because the volatilization of the constituent elements is inhibited and a subsequent heat treatment is not necessary. In this study, Bi-doped tetrahedrites Cu12Sb4-yBiyS13 (y = 0-0.4) were prepared by MA and hot pressing. X-ray diffraction analyses revealed that all specimens consisted of single-phase tetrahedrite. However, with increasing Bi content, skinnerite Cu3SbS3 was detected. The electrical conductivity increased and the Seebeck coefficient deceased with increasing Bi content as result of the substitution of Bi at Sb sites. In addition, the thermal conductivity increased as the Bi content increased because of the increase in electronic thermal conductivity. A high dimensionless figure of merit of 0.88 was obtained at 723 K for Cu12Sb3.9Bi0.1S13.

Thermoelectric Performance of Sn and Bi Double-Doped Permingeatite

“…was estimated using the equation [25,26]. In this study, a specific heat of 0.32 Jg -1 K -1 was used to evaluate the thermal conductivity [27], and Fig.…”

Thermoelectric Properties of Ta-doped Zr0.6-xTi0.4TaxNiSn n-type Half-Heusler Materials

“…열전발전기술 (thermoelectric generation)은 대기 중으로 방출되는 산업폐열, 차량폐열, 선박폐열 등을 회수하여 재 활용할 수 있는 유용한 에너지 하베스팅 기술로서 기대를 모으고 있다. 300~500 K의 저온 대역에서는 Bi 2 Te 3 계열 의 열전소재가 상용화되어 사용되며, 600~1000 K의 중온 및 고온 대역에서는 tetrahedrite [1,2], skutterudite [3,4], 실리사이드 (silicide) [5,6] 등과 함께 하프-호이슬러 (half-Heusler, HH) [7][8][9][10][11][12][13][14] 계열의 소재가 많이 연구되고 있다. 하프-호이슬러 열전소재는 열적안정성과 기계적강도 가 우수하고 소재의 독성이 적다는 장점이 있어 잠재적으 로 유망한 소재이다 [7][8][9][10][11][12][13][14].…”

Substitution Site Selection and Thermoelectric Performance‐Enhancing Mechanism of Cu12Sb4S13 Doped with Pb/Ge/Sn

“…Most studies [ 10–33 ] on Cu 12 Sb 4 S 13 have focused on the single‐ or cosubstitution on the Cu, Sb, or S sites. Such as Co, Zn, Fe, Ni, Cd, Hg, Mg, Sn, Ag, and Mn at Cu sites, Bi, Te, As, Ge, and Sn at Sb sites, and Se at S sites have been reported so far.…”