Synthesis of Bi-Te-Se-based Thermoelectric Powder by an Oxide-Reduction Process

Lee, Gil-Geun; Park, Bae-Gun; Kim, Woo-Yeol; Kim, Kyung‐Tae; Ha, Gook Hyun

doi:10.3365/eml.2010.09.123

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…Synthesis of porous thermoelectric materials such as Bi 2 Te 3 [27][28][29], (Bi,Sb) 2 Te 3 [29][30][31], Ge 0.77 Ag 0.1 Sb 0.13 Te (TAGS) [32], Bi 2 Te 1-x Se x [33,34] and CsBi 4-Te 6 [35] via this technique has been previously reported. In this method, a mixture of oxides is reduced at a given temperature in a dry hydrogen flow.…”

Section: Graphic Abstract Introductionmentioning

confidence: 99%

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

et al. 2020

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Highly porous, In-filled CoSb 3 skutterudite materials with an attractive thermoelectric figure of merit (ZT * 1) and corresponding dense samples were fabricated through the cost-effective method of reduction in oxides in dry hydrogen and the pulsed electric current sintering (PECS) method, respectively. The reduction process was described in detail using in situ thermogravimetric analysis of Co 2 O 3 , Sb 2 O 3 and In(NO 3) 3 Á5H 2 O separately and in a mixture. Two methods to synthesise the same material were examined: (a) free sintering of an initially reduced powder and (b) PECS. The free-sintered materials with higher porosities (up to * 40%) exhibited lower values of electrical conductivity than the dense PECS samples (porosity up to * 5%), but the benefit of an even sixfold reduction in thermal conductivity resulted in higher ZT values. The theoretical values of thermal conductivity for various effective media models considering randomly oriented spheroid pores are in good agreement with the experimental thermal conductivity data. The assumed distribution and shape of the pores correlated well with the scanning electron microscope analysis of the microstructure. The lowest value of thermal conductivity, equal to 0.5 W/m K, was measured at 523 K for In 0.1 Co 4 Sb 12 with 41% porosity. The highest value of ZT max = 1.0 at 673 K was found for the In 0.2 Co 4 Sb 12 sample in which the porosity was 36%.

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Section: Graphic Abstract Introductionmentioning

confidence: 99%

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

et al. 2020

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“…Bi 2 Te 3 -based thermoelectric modules can generate power from low-temperature thermal energy ( ≤ 200°C). These devices produce electricity when a temperature gradient is applied, and exhibit heating or cooling characteristics when a current is applied, depending on the current direction [6][7][8][9][10]. Commercial thermoelectric modules generally comprise p-and n-type thermoelectric materials in series connected by Cu electrodes on a ceramic plate.…”

Section: Introductionmentioning

confidence: 99%

Ni–W–P layer-induced strength improvement of solder joint in Bi₂Te₃ thermoelectric module

Bae

Nguyen

Son

2023

Science and Technology of Welding and Joining

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In this study, we examined the thermal stability, bonding strength, and interfacial characteristic of a Ni-W-P coating applied for solder joint of Bi 2 Te 3 thermoelectric modules. This layer had uniform thickness and was confirmed to be amorphous even after annealing at 200°C for 150 h, demonstrating its thermal stability. Moreover, the barrier layer hindered the interdiffusion between Sn and Te, eliminating the formation of brittle intermetallic at the solder joint. Thus, the bonding strengths of p-and n-type thermoelectric units were improved approximately 1.3and 2.8-fold, respectively, compared to the bonding strengths obtained without a Ni-W-P layer. In addition, the bonding strength was not affected by heating at 200°C for 150 h. The reliability of bonding strength was caused by the excellent thermal stability, and solder wettability of the barrier layer, which resulted in a bonding interface without brittle intermetallic and defects.

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“…In contrast, the melting/grinding method can yield stable material properties and less material loss, but grain refinement is restricted and composition control is difficult. In the oxide reduction process, composites are synthesized from oxides and metal-based powder for application in thermoelectric semiconductors, and they undergo heat treatment to compensate for the above-mentioned weaknesses [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Park¹,

Koo²,

Park³

et al. 2019

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In this study, an oxide reduction process and a reduction-sintering process were employed to synthesize a thermoelectric alloy from three thermoelectric composite oxide powders, and the thermoelectric properties were investigated as a function of the milling duration. Fine grain sizes were analyzed by via X-ray diffraction and scanning electron microscopy, to investigate the influence of the milling duration on the synthesized samples. It was found that microstructural changes, the Seebeck coefficient, and the electrical resistivity of the compounds were highly dependent on the sample milling duration. Additionally, the carrier concentration considerably increased in the samples milled for 6 h; this was attributed to the formation of antisite defects introduced by the accumulated thermal energy. Moreover, the highest value of ZT (=1.05) was achieved at 373K by the 6-h milled samples. The temperature at which the ZT value maximized varied according to the milling duration, which implies that the milling duration of the three thermoelectric composite oxide powders should be carefully optimized for their effective application.

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Synthesis of Bi-Te-Se-based Thermoelectric Powder by an Oxide-Reduction Process

Cited by 12 publications

References 17 publications

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

Ni–W–P layer-induced strength improvement of solder joint in Bi₂Te₃ thermoelectric module

Archives of Metallurgy and Materials

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Synthesis of Bi-Te-Se-based Thermoelectric Powder by an Oxide-Reduction Process

Cited by 12 publications

References 17 publications

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

New synthesis route of highly porous InxCo4Sb12 with strongly reduced thermal conductivity

Ni–W–P layer-induced strength improvement of solder joint in Bi2Te3 thermoelectric module

Archives of Metallurgy and Materials

Contact Info

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About

Ni–W–P layer-induced strength improvement of solder joint in Bi₂Te₃ thermoelectric module